View source for Political party strength in Oregon

{{More citations needed|date=September 2020}}
The following table indicates the party of elected officials in the [[U.S. state]] of [[Oregon]]:
*[[List of Governors of Oregon|Governor]]
*[[Oregon Secretary of State]]
*[[Oregon Attorney General|Attorney General]]
*[[Oregon State Treasurer|State Treasurer]]
*[[Oregon Bureau of Labor and Industries|Commissioner of Labor and Industries]]
*[[Oregon Superintendent of Public Instruction|Superintendent of Public Instruction]]

The table also indicates the historical party composition in the:
*[[Oregon State Senate|State Senate]]
*[[Oregon House of Representatives|State House of Representatives]]
*[[List of United States Senators from Oregon|State delegation to the U.S. Senate]]
*[[List of United States Representatives from Oregon|State delegation to the U.S. House of Representatives]]

For years in which a [[U.S. presidential election|presidential election]] was held, the table indicates which party's nominees received the state's electoral votes.

The parties are as follows:
*{{legend2|#CCEEFF|[[Democratic Party (United States)|Democratic]]|border=1px solid #AAAAAA}} (D)
*{{legend2|#CCFFCC|Democratic&ndash;[[Populist Party (United States)|Populist]] [[Electoral fusion|fusion]]|border=1px solid #AAAAAA}} (DP)
*{{legend2|#DDDDCC|[[Independent (politician)|Independent]]|border=1px solid #AAAAAA}} (I)<ref>Indicates a politician independent of party affiliation, not to be confused with the [[Independent Party of Oregon]], [[Independence Party of America]], or other similarly named parties.</ref>
*{{legend2|#FFFFFF|[[Nonpartisan]]|border=1px solid #AAAAAA}} (NP) or none
*{{legend2|#FFB6B6|[[Republican Party (United States)|Republican]]|border=1px solid #AAAAAA}} (R)
*{{legend2|#FFFFCC|[[Whig Party (United States)|Whig]]|border=1px solid #AAAAAA}} (W).

{| class="wikitable sortable" style="text-align:center"
!rowspan=2|Year!!colspan=6|Executive offices!!colspan=2|[[Oregon Legislative Assembly|Legislative Assembly]]!!colspan=3|[[United States congressional delegations from Oregon|United States Congress]]!!rowspan=2|[[United States presidential election|Electoral College votes]]
|-
![[List of Governors of Oregon|Governor]]<ref name="BlueBookSO">Except where otherwise noted, names, term dates, and circumstances of transition were sourced from: {{cite web | author = Oregon Secretary of State, Archives Division | author-link = Oregon State Archives | title = Earliest Authorities in Oregon History | url = https://sos.oregon.gov/blue-book/Documents/elections/history-officials.pdf | work = Oregon Blue Book | location = [[Salem, Oregon]] | access-date = 2009-05-03}}</ref>!![[Oregon Secretary of State|Secretary of State]]<ref name="BlueBookSO"/>!![[Oregon Attorney General|Attorney General]]<ref name="BlueBookSO"/>!![[Oregon State Treasurer|Treasurer]]<ref name="BlueBookSO"/>!![[Oregon Bureau of Labor and Industries|Comm. of Labor]]<ref name="BlueBookSO"/><ref>The exact title of the official chiefly responsible for enforcement of labor and related laws has varied through its existence, beginning with Labor Commissioner in 1903, becoming Commissioner of the Bureau of Labor Statistics and Inspector of Factories and Workshops in 1918, then Commissioner of the Bureau of Labor in 1930, and finally Commissioner of Labor and Industries in 1979.</ref>!![[Oregon Superintendent of Public Instruction|Supt. of Pub. Inst.]]<ref name="BlueBookSO"/>!![[Oregon State Senate|State Senate]]!![[Oregon House of Representatives|State House]]!![[List of United States Senators from Oregon#Class II|U.S. Senator (Class II)]]!![[List of United States Senators from Oregon#Class III|U.S. Senator (Class III)]]!![[List of United States Representatives from Oregon|U.S. House]]
|-
|colspan=13 style="background:#21421E; color:white"|'''<small>Provisional Government of Oregon</small>'''
|-
!1845
|rowspan=3|[[George Abernethy]]<ref>[[Champoeg Meetings|Meetings]] at [[Champoeg, Oregon|Champoeg]] led up to the first constitution of the [[Oregon Country]], and several petitions for U.S. territorial status. The resulting acts also created this body as a [[Provisional Government of Oregon|provisional government for the region]]. The first executives of this government were a three-person elected committee known as the Executive Committee. In 1845, elections for a chief executive were held.</ref>
|rowspan=3 colspan=11 style="background:#C3B091"|
|-
!1846
|-
!1847
|-
|colspan=13 style="background:#21421E; color:white"|'''<small>Oregon Territory</small>'''
|-
!1848
|rowspan=2 {{Party shading/Democratic}}|[[Joseph Lane]] (D)<ref>Governor of [[Oregon Territory]] appointed by [[President of the United States|President]] [[James Polk]].</ref>
|{{Party shading/Whig}}|<small>[[Theophilus R. Magruder]] (W)</small>
|rowspan=17 style="background:#C3B091"|
|rowspan=3|[[James Taylor (Oregon politician)|James Taylor]]
|colspan=7 style="background:#C3B091"|
|rowspan=17 style="background:#C3B091"|
|-
!1849
|rowspan=2 {{Party shading/Democratic}}|[[Kintzing Prichette]] (D)
|rowspan=16 colspan=6 style="background:#C3B091"|
|rowspan=3 {{Party shading/Democratic}}|[[Samuel Thurston]] (D)
|-
!rowspan=2|1850
|{{Party shading/Democratic}}|<small>Kintzing Prichette (D)<ref name=terr-act>Acting territorial governor.</ref></small>
|-
|rowspan=5 {{Party shading/Whig}}|[[John P. Gaines]] (W)<ref>Governor of Oregon Territory appointed by President [[Zachary Taylor]].</ref>
|rowspan=5 {{Party shading/Whig}}|[[Edward D. Hamilton]] (W)
|-
!rowspan=2|1851
|<small>[[Levi A. Rice]]</small>
|rowspan=13 {{Party shading/Democratic}}|Joseph Lane (D)
|-
|<small>[[William W. Buck]]</small>
|-
!1852
|rowspan=7|[[John D. Boon]]
|-
!rowspan=4|1853
|-
|{{Party shading/Democratic}}|<small>Joseph Lane (D)<ref name=terr-act/></small>
|rowspan=5 {{Party shading/Democratic}}|[[George Law Curry]] (D)
|-
|{{Party shading/Democratic}}|<small>George Law Curry (D)<ref name=terr-act/></small>
|-
|rowspan=2 {{Party shading/Democratic}}|[[John Wesley Davis|John W. Davis]] (D)<ref name=terr-pierce>Governor of Oregon Territory appointed by President [[Franklin Pierce]].</ref>
|-
!rowspan=2|1854
|-
|rowspan=5 {{Party shading/Democratic}}|George Law Curry (D)<ref name=terr-pierce/>
|-
!1855
|rowspan=4 {{Party shading/Democratic}}|[[Benjamin F. Harding]] (D)
|<small>[[Nathaniel H. Lane]]</small>
|-
!1856
|rowspan=3|John D. Boon
|-
!1857
|-
!1858
|-
|colspan=13 style="background:#21421E; color:white"|'''<small>State of Oregon</small>'''
|-
!rowspan=2|1859
|rowspan=7 {{Party shading/Democratic}}|[[John Whiteaker]] (D)
|rowspan=7 {{Party shading/Democratic}}|[[Lucien Heath]] (D)
|rowspan=42 style="background:#C3B091"|<ref>Office of Attorney General established by statute on May 20, 1891.</ref>
|rowspan=7 {{Party shading/Democratic}}|John D. Boon (D)
|rowspan=57 style="background:#C3B091"|<ref>Office of Labor Commissioner established by statute on June 2, 1903.</ref>
|rowspan=19 style="background:#C3B091"|<ref>Prior to 1872, the governor was ''ex officio'' the Superintendent of Public Instruction. The Legislative Assembly established Superintendent of Public Instruction as a separate office by statute in February 1872. {{cite web | publisher= [[Oregon State Archives]] | title = Oregon Department of Education Administrative Overview | date = April 2007 | url = http://records.sos.state.or.us/ORSOSWebDrawer/RecordView/7589722 | access-date = 2012-02-18}}</ref>
|rowspan=4 {{Party shading/Democratic}}|14D, 2R
|rowspan=4 {{Party shading/Democratic}}|30D, 4R
|{{Party shading/Democratic}}|<small>[[Delazon Smith]] (D)</small>
|rowspan=4 {{Party shading/Democratic}}|Joseph Lane (D)
|{{Party shading/Democratic}}|<small>[[La Fayette Grover]] (D)</small>
|rowspan=2 style="background:#C3B091"|
|-
|rowspan=2 |''Vacant''<ref>Legislature failed to elected a Senator from March 4, 1859 to October 2, 1860.</ref>
|rowspan=3 {{Party shading/Democratic}}|<small>[[Lansing Stout]] (D)</small>
|-
!rowspan=2|1860
|rowspan=7 {{Party shading/Republican}}|[[Abraham Lincoln]] and [[Hannibal Hamlin]] (R) {{aye}}
|-
|rowspan=2 {{Party shading/Republican}}|<small>[[Edward Dickinson Baker|Edward D. Baker]] (R)</small><ref>Killed in the [[Battle of Ball's Bluff]] October 21, 1861.</ref>
|-
!rowspan=2|1861
|rowspan=4 {{Party shading/Democratic}}|13D, 3R
|rowspan=4 {{Party shading/Democratic}}|24D, 10R
|rowspan=9 {{Party shading/Democratic}}|[[James Nesmith|James W. Nesmith]] (D)
|{{Party shading/Democratic}}|<small>[[Andrew J. Thayer]] (D)<ref>Election successfully contested by [[George K. Shiel]] July 30, 1861.</ref></small>
|-
|rowspan=2 {{Party shading/Democratic}}|<small>[[Benjamin Stark]] (D)<ref>Appointed to office October 29, 1861. Never elected.</ref></small>
|rowspan=2 {{Party shading/Democratic}}|<small>[[George K. Shiel]] (D)</small>
|-
!rowspan=2|1862
|-
|rowspan=5 {{Party shading/Republican}}|[[A. C. Gibbs|Addison C. Gibbs]] (R)
|rowspan=10 {{Party shading/Republican}}|[[Samuel E. May]] (R)
|rowspan=10 {{Party shading/Republican}}|[[Edwin N. Cooke]] (R)
|rowspan=3 {{Party shading/Democratic}}|Benjamin F. Harding (D)
|-
!1863
|rowspan=2 {{Party shading/Republican}}|10R, 5D, 1I
|rowspan=2 {{Party shading/Republican}}|33R, 1D
|rowspan=2 {{Party shading/Republican}}|[[John R. McBride]] (R)
|-
!1864
|rowspan=5 {{Party shading/Unionist}}|Abraham Lincoln and [[Andrew Johnson]] (NU) {{aye}}
|-
!1865
|rowspan=3 {{Party shading/Republican}}|15R, 3D
|rowspan=3 {{Party shading/Republican}}|33R, 5D
|rowspan=8 {{Party shading/Republican}}|[[George Henry Williams]] (R)
|rowspan=3 {{Party shading/Republican}}|<small>[[James Henry Dickey Henderson|James H. D. Henderson]] (R)</small>
|-
!rowspan=2|1866
|-
|rowspan=5 {{Party shading/Republican}}|[[George Lemuel Woods|George L. Woods]] (R)
|-
!1867
|rowspan=2 {{Party shading/Republican}}|17R, 7D, 1I
|rowspan=2 {{Party shading/Republican}}|24R, 23D
|rowspan=7 {{Party shading/Republican}}|[[Henry W. Corbett]] (R)
|rowspan=2 {{Party shading/Republican}}|[[Rufus Mallory]] (R)
|-
!1868
|rowspan=5 {{Party shading/Democratic}}|[[Horatio Seymour]] and [[Francis Preston Blair, Jr.]] (D) {{nay}}
|-
!1869
|rowspan=3 {{Party shading/Democratic}}|12D, 10R
|rowspan=3 {{Party shading/Democratic}}|25D, 18R
|rowspan=3 {{Party shading/Democratic}}|[[Joseph Showalter Smith|Joseph S. Smith]] (D)
|-
!rowspan=2|1870
|-
|rowspan=8 {{Party shading/Democratic}}|La Fayette Grover (D)<ref>Resigned February 1, 1877.</ref>
|rowspan=10 {{Party shading/Democratic}}|[[Stephen F. Chadwick]] (D)
|rowspan=5 {{Party shading/Democratic}}|[[L. Fleischner]] (D)
|-
!1871
|rowspan=2 {{Party shading/Democratic}}|13D, 9R
|rowspan=2 {{Party shading/Democratic}}|28D, 19R
|rowspan=7 {{Party shading/Democratic}}|[[James K. Kelly]] (D)
|rowspan=2 {{Party shading/Democratic}}|[[James H. Slater]] (D)
|-
!1872
|rowspan=3 {{Party shading/Democratic}}|[[Sylvester C. Simpson|Sylvester Simpson]] (D)<ref>Appointed to office February 1872. {{cite web | author = Oregon Department of Education | author-link = Oregon Department of Education | title = Superintendent Tenures | url = http://www.ode.state.or.us/search/page/?id=632 | access-date = 2009-05-07 | archive-url = https://web.archive.org/web/20100426115318/http://www.ode.state.or.us/search/page/?id=632 | archive-date = 2010-04-26 | url-status = dead }} Never elected.</ref>
|rowspan=5 {{Party shading/Republican}}|[[Ulysses S. Grant]] and [[Henry Wilson]] (R) {{aye}}
|-
!1873
|rowspan=3 {{Party shading/Republican}}|13R, 9D
|rowspan=3 {{Party shading/Republican}}|32R, 17D
|rowspan=8 {{Party shading/Republican}}|[[John H. Mitchell]] (R)
|{{Party shading/Republican}}|<small>[[Joseph G. Wilson]] (R)<ref>Died in office July 2, 1873.</ref></small>
|-
!rowspan=2|1874
|rowspan=2 {{Party shading/Democratic}}|<small>James W. Nesmith (D)</small>
|-
|rowspan=5 {{Party shading/Democratic}}|[[A. H. Brown]] (D)
|rowspan=5 {{Party shading/Republican}}|[[Levi L. Rowland|L. L. Rowland]] (R)
|-
!1875
|rowspan=2 {{Party shading/Democratic}}|18D, 11R, 1I
|rowspan=2 bgcolor=#D8BFD8|23I, 20D, 17R<ref>An Democrat-turned-Independent, John C. Drain, was elected Speaker, and the Independents organized the chamber with the help of Democrats. [https://www.oregonlegislature.gov/citizen_engagement/Reports/Chronological.pdf p.98-100]</ref>
|{{Party shading/Democratic}}|<small>[[George Augustus La Dow|George A. La Dow]] (D)<ref>Died in office May 1, 1875.</ref></small>
|-
!1876
|{{Party shading/Democratic}}|<small>[[Lafayette Lane]] (D)</small>
|rowspan=5 {{Party shading/Republican}}|[[Rutherford B. Hayes]] and [[William A. Wheeler]] (R) {{aye}}
|-
!1877
|rowspan=2 {{Party shading/Democratic}}|<small>Stephen F. Chadwick (D)<ref>Succeeded to office February 1, 1877.</ref></small>
|rowspan=3 {{Party shading/Democratic}}|18D, 10R, 2I
|rowspan=3 bgcolor=#D8BFD8|30R, 27D, 3I<ref>A Democrat, James Knox Weatherford, was elected Speaker, and the Democrats organized the chamber with the help of Independents and renegade Republicans.</ref>
|rowspan=8 {{Party shading/Democratic}}|La Fayette Grover (D)
|rowspan=3 {{Party shading/Republican}}|[[Richard Williams (congressman)|Richard Williams]] (R)
|-
!rowspan=2|1878
|-
|rowspan=5 {{Party shading/Democratic}}|[[W. W. Thayer|William W. Thayer]] (D)
|rowspan=11 {{Party shading/Republican}}|[[Rockey P. Earhart|Rockey Preston Earhart]] (R)
|rowspan=11 {{Party shading/Republican}}|[[Edward Hirsch (Oregon politician)|Edward Hirsch]] (R)
|rowspan=5 {{Party shading/Republican}}|[[Leonard J. Powell]]<ref>Form of name sourced from: {{cite web | author = Oregon Department of Education | author-link = Oregon Department of Education | title = Superintendent Tenures | url = http://www.ode.state.or.us/search/page/?id=632 | access-date = 2009-05-07 | archive-url = https://web.archive.org/web/20100426115318/http://www.ode.state.or.us/search/page/?id=632 | archive-date = 2010-04-26 | url-status = dead }}</ref> (R)
|-
!1879
|rowspan=2 {{Party shading/Democratic}}|18D, 10R, 2I
|rowspan=2 bgcolor=#D8BFD8|30D, 28R, 2I<ref>A Democrat, John M. Thompson, was elected Speaker, and the Democrats organized the chamber with the help of Independents.</ref>
|rowspan=7 {{Party shading/Democratic}}|James H. Slater (D)
|rowspan=2 {{Party shading/Democratic}}|[[John Whiteaker]] (D)
|-
!1880
|rowspan=5 {{Party shading/Republican}}|[[James A. Garfield]] and [[Chester A. Arthur]] (R) {{aye}}
|-
!1881
|rowspan=5 {{Party shading/Republican}}|16R, 14D
|rowspan=3 {{Party shading/Republican}}|40R, 20D
|rowspan=5 {{Party shading/Republican}}|[[Melvin Clark George]] (R)
|-
!rowspan=2|1882
|-
|rowspan=6 {{Party shading/Republican}}|[[Zenas Ferry Moody|Zenas F. Moody]] (R)
|rowspan=15 {{Party shading/Republican}}|[[Ebenezer B. McElroy|E. B. McElroy]] (R)
|-
!1883
|rowspan=2 {{Party shading/Republican}}|37R, 21D, 2I
|rowspan=14 {{Party shading/Republican}}|[[Joseph N. Dolph]] (R)
|-
!1884
|rowspan=5 {{Party shading/Republican}}|[[James G. Blaine]] and [[John A. Logan]] (R) {{nay}}
|-
!rowspan=2|1885
|rowspan=3 {{Party shading/Republican}}|17R, 13D
|rowspan=3 {{Party shading/Republican}}|35R, 25D
|''Vacant''<ref>Legislature failed to elected a Senator from March 4, 1885 to December 17, 1885.</ref>
|rowspan=10 {{Party shading/Republican}}|[[Binger Hermann]] (R)
|-
|rowspan=13 {{Party shading/Republican}}|John H. Mitchell (R)
|-
!1886
|-
!1887
|rowspan=9 {{Party shading/Populist}}|[[Sylvester Pennoyer]] (DP)
|rowspan=9 {{Party shading/Republican}}|[[George W. McBride]] (R)
|rowspan=5 {{Party shading/Democratic}}|[[G. W. Webb]] (D)
|rowspan=2 {{Party shading/Republican}}|19R, 11D
|rowspan=2 {{Party shading/Republican}}|34R, 26D
|-
!1888
|rowspan=5 {{Party shading/Republican}}|[[Benjamin Harrison]] and [[Levi P. Morton]] (R) {{aye}}
|-
!1889
|rowspan=2 {{Party shading/Republican}}|21R, 9D
|rowspan=2 {{Party shading/Republican}}|51R, 9D
|-
!1890
|-
!rowspan=2|1891
|rowspan=10 {{Party shading/Republican}}|[[Phil Metschan]] (R)
|rowspan=3 {{Party shading/Republican}}|23R, 7D
|rowspan=3 {{Party shading/Republican}}|43R, 17D
|-
|rowspan=4 {{Party shading/Democratic}}|[[George Earle Chamberlain]] (D)<ref>Appointed to office May 20, 1891. Subsequently elected in 1892.</ref>
|-
!1892
|rowspan=4 {{Party shading/Republican}}|Benjamin Harrison and [[Whitelaw Reid]] (R) {{nay}}
|-
!1893
|rowspan=2 {{Party shading/Republican}}|16R, 13D, 1P
|rowspan=2 {{Party shading/Republican}}|38R, 19D, 3P
|rowspan=25 {{Party shading/Republican}}|2R
|-
!1894
|-
!1895
|rowspan=5 {{Party shading/Republican}}|[[William Paine Lord]] (R)
|rowspan=5 {{Party shading/Republican}}|[[Harrison R. Kincaid]] (R)
|rowspan=5 {{Party shading/Republican}}|[[Cicero M. Idleman]] (R)
|rowspan=5 {{Party shading/Republican}}|[[George M. Irwin|G. M. Irwin]] (R)
|rowspan=2 {{Party shading/Republican}}|19R, 8D, 3P
|rowspan=2 {{Party shading/Republican}}|53R, 7P
|rowspan=7 {{Party shading/Republican}}|George W. McBride (R)
|-
!1896
|rowspan=5 {{Party shading/Republican}}|[[William McKinley]] and [[Garret Hobart]] (R) {{aye}}
|-
!1897
|rowspan=5 {{Party shading/Republican}}|24R, 3D, 3P
|rowspan=3 {{Party shading/Republican}}|39R, 17P, 4D
|rowspan=2| ''Vacant''<ref>Legislature failed to elected a Senator from March 4, 1897 to October 7, 1898.</ref>
|-
!rowspan=2|1898
|-
|rowspan=5 {{Party shading/Republican}}|[[Joseph Simon]] (R)
|-
!1899
|rowspan=4 {{Party shading/Republican}}|[[T. T. Geer]] (R)
|rowspan=9 {{Party shading/Republican}}|[[Frank L. Dunbar]] (R)
|rowspan=4 {{Party shading/Republican}}|[[D. R. N. Blackburn]] (R)
|rowspan=9 {{Party shading/Republican}}|[[Charles S. Moore]] (R)
|rowspan=15 {{Party shading/Republican}}|[[John H. Ackerman|J. H. Ackerman]] (R)
|rowspan=2 {{Party shading/Republican}}|42R, 17P, 1D
|-
!1900
|rowspan=5 {{Party shading/Republican}}|William McKinley and [[Theodore Roosevelt]] (R) {{aye}}
|-
!1901
|rowspan=2 {{Party shading/Republican}}|21R, 4 Cit., 3P, 1D, 1 Union
|rowspan=2 {{Party shading/Republican}}|35R, 13 Cit., 7D, 3 Union, 1P, 1 vac.
|rowspan=6 {{Party shading/Republican}}|John H. Mitchell (R)<ref>Died in office December 8, 1905.</ref>
|-
!1902
|-
!rowspan=2|1903
|rowspan=8 {{Party shading/Democratic}}|George Earle Chamberlain (D)<ref>Resigned February 28, 1909.</ref>
|rowspan=17 {{Party shading/Republican}}|[[Andrew M. Crawford]] (R)
|rowspan=3 {{Party shading/Republican}}|21R, 3D, 3 Cit., 2 Union, 1P
|rowspan=3 {{Party shading/Republican}}|48R, 11D, 1 Cit.
|rowspan=8 {{Party shading/Republican}}|[[Charles William Fulton|Charles W. Fulton]] (R)
|-
|rowspan=22 {{Party shading/Republican}}|[[O. P. Hoff]] (R)<ref>Appointed to office June 2, 1903. Subsequently elected in 1906.</ref>
|-
!1904
|rowspan=5 {{Party shading/Republican}}|Theodore Roosevelt and [[Charles W. Fairbanks]] (R) {{aye}}
|-
!1905
|rowspan=2 {{Party shading/Republican}}|25R, 5D
|rowspan=2 {{Party shading/Republican}}|50R, 10D
|-
!1906
|{{Party shading/Democratic}}|<small>[[John M. Gearin]] (D)<ref>Appointed to office December 13, 1905. Never elected.</ref></small>
|-
!rowspan=2|1907
|rowspan=7 {{Party shading/Republican}}|[[Frank W. Benson (Oregon Governor)|Frank W. Benson]] (R)<ref>Died in office April 14, 1911.</ref>
|rowspan=6 {{Party shading/Republican}}|[[George A. Steel]] (R)
|rowspan=6 {{Party shading/Republican}}|24R, 6D
|rowspan=3 {{Party shading/Republican}}|59R, 1D
|{{Party shading/Republican}}|<small>[[Frederick W. Mulkey]] (R)</small>
|-
|rowspan=8 {{Party shading/Republican}}|[[Jonathan Bourne, Jr.]] (R)
|-
!1908
|rowspan=6 {{Party shading/Republican}}|[[William Howard Taft]] and [[James S. Sherman]] (R) {{aye}}
|-
!1909
|rowspan=2 {{Party shading/Republican}}|<small>Frank W. Benson (R)<ref>Succeeded to office March 1, 1909.</ref><ref>Resigned June 17, 1910.</ref></small>
|rowspan=3 {{Party shading/Republican}}|53R, 7D
|rowspan=19 {{Party shading/Democratic}}|George Earle Chamberlain (D)
|-
!rowspan=2|1910
|-
|{{Party shading/Republican}}|<small>[[Jay Bowerman]] (R)<ref>Succeeded to office June 17, 1910.</ref></small>
|-
!rowspan=2|1911
|rowspan=6 {{Party shading/Democratic}}|[[Oswald West]] (D)
|rowspan=12 {{Party shading/Republican}}|[[Thomas B. Kay]] (R)
|rowspan=4 {{Party shading/Republican}}|[[Lewis R. Alderman|L. R. Alderman]] (R)<ref>Resigned June 28, 1913. {{cite web | author = Oregon Department of Education | author-link = Oregon Department of Education | title = Superintendent Tenures | url = http://www.ode.state.or.us/search/page/?id=632 | access-date = 2009-05-07 | archive-url = https://web.archive.org/web/20100426115318/http://www.ode.state.or.us/search/page/?id=632 | archive-date = 2010-04-26 | url-status = dead }}</ref>
|rowspan=3 {{Party shading/Republican}}|27R, 3D
|rowspan=3 {{Party shading/Republican}}|58R, 2D
|-
|rowspan=14 {{Party shading/Republican}}|[[Ben W. Olcott]] (R)<ref>Appointed to office April 17, 1911. Subsequently elected in 1912.</ref><ref>Resigned May 28, 1920, after succession to governor in 1919.</ref>
|-
!1912
|rowspan=5 {{Party shading/Democratic}}|[[Woodrow Wilson]] and [[Thomas R. Marshall]] (D) {{aye}}
|-
!rowspan=2|1913
|rowspan=5 {{Party shading/Republican}}|28R, 2D
|rowspan=3 {{Party shading/Republican}}|48R, 7Pg, 5D
|rowspan=6 {{Party shading/Democratic}}|[[Harry Lane]] (D)<ref>Died in office May 23, 1917.</ref>
|rowspan=15 {{Party shading/Republican}}|3R
|-
|rowspan=19 {{Party shading/Republican}}|[[Julius A. Churchill|J. A. Churchill]] (R)<ref>Appointed to office July 1, 1913. Subsequently elected in 1914.</ref><ref>Resigned June 1, 1926.</ref>
|-
!1914
|-
!1915
|rowspan=7 {{Party shading/Republican}}|[[James Withycombe]] (R)<ref>Died in office March 3, 1919.</ref>
|rowspan=9 {{Party shading/Republican}}|[[George M. Brown]] (R)<ref>Resigned October 14, 1920.</ref>
|rowspan=2 {{Party shading/Republican}}|56R, 4D
|-
!1916
|rowspan=7 {{Party shading/Republican}}|[[Charles Evans Hughes]] and Charles W. Fairbanks (R) {{nay}}
|-
!rowspan=2|1917
|rowspan=4 {{Party shading/Republican}}|24R, 5D, 1I
|rowspan=4 {{Party shading/Republican}}|55R, 4D, 1I
|-
|rowspan=2 {{Party shading/Republican}}|<small>[[Charles L. McNary]] (R)<ref>Appointed to office May 29, 1917. Subsequently elected in 1918 for the term beginning March 4, 1919.</ref></small>
|-
!rowspan=2|1918
|-
|{{Party shading/Republican}}|<small>Frederick W. Mulkey (R)<ref>Resigned December 17, 1918.</ref></small>
|-
!rowspan=2|1919
|rowspan=8 {{Party shading/Republican}}|O. P. Hoff (R)<ref>Died in office March 18, 1924.</ref>
|rowspan=33 {{Party shading/Republican}}|[[C. H. Gram]] (R)
|rowspan=4 {{Party shading/Republican}}|24R, 3D, 3I
|rowspan=4 {{Party shading/Republican}}|54R, 6D
|rowspan=35 {{Party shading/Republican}}|Charles L. McNary (R)<ref>Appointed to office December 18, 1918. Previously elected for the term beginning March 4, 1919.</ref><ref>Died in office February 25, 1944.</ref>
|-
|rowspan=5 {{Party shading/Republican}}|Ben W. Olcott (R)<ref>Succeeded to office March 3, 1919.</ref>
|-
!rowspan=2|1920
|rowspan=5 {{Party shading/Republican}}|[[Warren G. Harding]] and [[Calvin Coolidge]] (R) {{aye}}
|-
|rowspan=11 {{Party shading/Republican}}|[[Sam A. Kozer]] (R)<ref>Appointed to office May 28, 1920. Subsequently elected in 1920.</ref><ref>Resigned September 24, 1928.</ref>
|rowspan=31 {{Party shading/Republican}}|[[Isaac Homer Van Winkle|Isaac H. Van Winkle]] (R)<ref>Appointed to office October 14, 1920. Subsequently elected in 1920.</ref><ref>Died in office December 14, 1943.</ref>
|-
!1921
|rowspan=2 {{Party shading/Republican}}|27R, 2I, 1D
|rowspan=2 {{Party shading/Republican}}|58R, 2D
|rowspan=8 {{Party shading/Republican}}|[[Robert N. Stanfield]] (R)
|-
!1922
|-
!1923
|rowspan=6 {{Party shading/Democratic}}|[[Walter M. Pierce]] (D)
|rowspan=6 {{Party shading/Republican}}|26R, 4D
|rowspan=3 {{Party shading/Republican}}|51R, 9D
|rowspan=3 {{Party shading/Republican}}|2R, 1D
|-
!rowspan=2|1924
|rowspan=6 {{Party shading/Republican}}|Calvin Coolidge and [[Charles G. Dawes]] (R) {{aye}}
|-
|{{Party shading/Democratic}}|<small>[[Jefferson Myers]] (D)<ref>Appointed to office March 18, 1924. Never elected.</ref></small>
|-
!1925
|rowspan=9 {{Party shading/Republican}}|Thomas B. Kay (R)<ref>Died in office April 29, 1931.</ref>
|rowspan=3 {{Party shading/Republican}}|57R, 3D
|rowspan=8 {{Party shading/Republican}}|3R
|-
!rowspan=2|1926
|-
|{{Party shading/Democratic}}|<small>[[Richard R. Turner|R. R. Turner]] (D)<ref>Appointed to office June 1, 1926. Never elected.</ref></small>
|-
!1927
|rowspan=4 {{Party shading/Republican}}|[[I. L. Patterson|Isaac L. Patterson]] (R)<ref>Died in office December 21, 1929.</ref>
|rowspan=13 {{Party shading/Republican}}|[[Charles A. Howard]] (R)<ref>Resigned September 1, 1937.</ref>
|rowspan=3 {{Party shading/Republican}}|27R, 3D
|rowspan=3 {{Party shading/Republican}}|56R, 4D
|rowspan=15 {{Party shading/Republican}}|[[Frederick Steiwer]] (R)<ref>Resigned January 31, 1938.</ref>
|-
!rowspan=2|1928
|rowspan=6 {{Party shading/Republican}}|[[Herbert Hoover]] and [[Charles Curtis]] (R) {{aye}}
|-
|rowspan=7 {{Party shading/Republican}}|[[Hal E. Hoss]] (R)<ref>Appointed to office September 24, 1928. Subsequently elected in 1928.</ref><ref>Died in office February 6, 1934.</ref>
|-
!1929
|rowspan=2 {{Party shading/Republican}}|28R, 2D
|rowspan=2 {{Party shading/Republican}}|58R, 2D
|-
!1930
|{{Party shading/Republican}}|<small>[[A. W. Norblad]] (R)<ref>Succeeded to office December 22, 1929.</ref></small>
|-
!rowspan=2|1931
|rowspan=5 {{Party shading/Independent (United States)}}|[[Julius Meier]] (I)
|rowspan=3 {{Party shading/Republican}}|29R, 1D
|rowspan=3 {{Party shading/Republican}}|53R, 7D
|rowspan=3 {{Party shading/Republican}}|2R, 1D
|-
|rowspan=11 {{Party shading/Republican}}|[[Rufus C. Holman]] (R)<ref>Appointed to office May 1, 1931. Subsequently elected in 1932.</ref><ref>Resigned December 27, 1938.</ref>
|-
!1932
|rowspan=11 {{Party shading/Democratic}}|[[Franklin D. Roosevelt]] and [[John Nance Garner]] (D) {{aye}}
|-
!1933
|rowspan=2 {{Party shading/Republican}}|22R, 8D
|rowspan=2 {{Party shading/Republican}}|42R, 17D, 1I
|rowspan=2 {{Party shading/Democratic}}|2D, 1R
|-
!1934
|{{Party shading/Republican}}|<small>[[Peter J. Stadelman]] (R)<ref>Appointed to office February 9, 1934. Never elected.</ref></small>
|-
!1935
|rowspan=7 {{Party shading/Democratic}}|[[Charles H. Martin]] (D)
|rowspan=11 {{Party shading/Republican}}|[[Earl Snell]] (R)
|rowspan=2 {{Party shading/Republican}}|17R, 13D
|rowspan=2 {{Party shading/Democratic}}|38D, 22R
|rowspan=2 {{Party shading/Republican}}|2R, 1D
|-
!1936
|-
!rowspan=2|1937
|rowspan=5 {{Party shading/Republican}}|18R, 12D
|rowspan=5 {{Party shading/Democratic}}|38D, 21R, 1I
|rowspan=5 {{Party shading/Democratic}}|2D, 1R
|-
|rowspan=8 {{Party shading/Democratic}}|[[Rex Putnam]] (D)<ref>Appointed to office September 1, 1937. Subsequently elected in 1938.</ref>
|-
!rowspan=3|1938
|-
|{{Party shading/Democratic}}|<small>[[Alfred E. Reames]] (D)<ref>Appointed to office February 1, 1938. Never elected.</ref></small>
|-
|{{Party shading/Republican}}|<small>[[Alexander G. Barry]] (R)</small>
|-
!1939
|rowspan=4 {{Party shading/Republican}}|[[Charles A. Sprague]] (R)
|rowspan=2 {{Party shading/Democratic}}|[[Walter E. Pearson]] (D)<ref>Appointed to office December 27, 1938. Never elected.</ref>
|rowspan=2 {{Party shading/Republican}}|22R, 8D
|rowspan=2 {{Party shading/Republican}}|46R, 13D, 1I
|rowspan=7 {{Party shading/Republican}}|Rufus C. Holman (R)
|rowspan=4 {{Party shading/Republican}}|2R, 1D
|-
!1940
|rowspan=4 {{Party shading/Democratic}}|Franklin D. Roosevelt and [[Henry A. Wallace]] (D) {{aye}}
|-
!1941
|rowspan=10 {{Party shading/Republican}}|[[Leslie M. Scott]] (R)
|rowspan=2 {{Party shading/Republican}}|25R, 5D
|rowspan=2 {{Party shading/Republican}}|38R, 22D
|-
!1942
|-
!1943
|rowspan=6 {{Party shading/Republican}}|[[Earl Snell]] (R)<ref name="Crash">Died in airplane crash October 28, 1947.</ref>
|rowspan=6 {{Party shading/Republican}}|[[Robert S. Farrell, Jr.]] (R)<ref name="Crash"/>
|rowspan=14 {{Party shading/Republican}}|[[W. E. Kimsey]] (R)
|rowspan=21|Rex Putnam (NP/D)<ref>Office converted from partisan to nonpartisan by the Legislative Assembly, effective with the 1942 election.</ref><ref>Resigned January 31, 1961.</ref>
|rowspan=3 {{Party shading/Republican}}|27R, 3D
|rowspan=3 {{Party shading/Republican}}|51R, 9D
|rowspan=14 {{Party shading/Republican}}|4R
|-
!rowspan=2|1944
|rowspan=11 {{Party shading/Republican}}|[[George Neuner]] (R)<ref>Appointed to office December 21, 1943. Subsequently elected in 1944.</ref>
|rowspan=6 {{Party shading/Democratic}}|Franklin D. Roosevelt and [[Harry S. Truman]] (D) {{aye}}
|-
|rowspan=12 {{Party shading/Republican}}|[[Guy Cordon]] (R)<ref>Appointed to office March 4, 1944. Subsequently elected in 1944.</ref>
|-
!1945
|rowspan=5 {{Party shading/Republican}}|25R, 5D
|rowspan=2 {{Party shading/Republican}}|50R, 10D
|rowspan=9 {{Party shading/Republican}}|[[Wayne Morse]] (R)
|-
!1946
|-
!rowspan=2|1947
|rowspan=3 {{Party shading/Republican}}|58R, 2D
|-
|rowspan=2 {{Party shading/Republican}}|<small>[[John Hubert Hall|John H. Hall]] (R)<ref>Succeeded to office October 30, 1947.</ref></small>
|rowspan=10 {{Party shading/Republican}}|[[Earl T. Newbry]] (R)<ref>Appointed to office November 3, 1947. Subsequently elected in 1948.</ref>
|-
!1948
|rowspan=4 {{Party shading/Republican}}|[[Thomas E. Dewey]] and [[Earl Warren]] (R) {{nay}}
|-
!1949
|rowspan=4 {{Party shading/Republican}}|[[Douglas McKay]] (R)<ref>Resigned December 27, 1952.</ref>
|rowspan=4 {{Party shading/Democratic}}|[[Walter J. Pearson]] (D)
|rowspan=2 {{Party shading/Republican}}|20R, 10D
|rowspan=4 {{Party shading/Republican}}|51R, 9D
|-
!1950
|-
!1951
|rowspan=2 {{Party shading/Republican}}|21R, 9D
|-
!1952
|rowspan=8 {{Party shading/Republican}}|[[Dwight D. Eisenhower]] and [[Richard Nixon]] (R) {{aye}}
|-
!1953
|rowspan=3 {{Party shading/Republican}}|[[Paul L. Patterson]] (R)<ref>Succeeded to office December 27, 1952. Subsequently elected in 1954.</ref><ref>Died in office January 31, 1956.</ref>
|rowspan=20 {{Party shading/Democratic}}|[[Robert Y. Thornton]] (D)
|rowspan=7 {{Party shading/Republican}}|[[Sig Unander]] (R)<ref>Resigned December 31, 1959.</ref>
|rowspan=2 {{Party shading/Republican}}|26R, 4D
|rowspan=2 {{Party shading/Republican}}|49R, 11D
|rowspan=2 {{Party shading/Independent (United States)}}|Wayne Morse (I)<ref>Changed party affiliation from Republican to Independent in 1952.</ref>
|-
!1954
|-
!1955
|rowspan=25 {{Party shading/Democratic}}|[[Norman O. Nilsen]] (D)
|rowspan=2 {{Party shading/Republican}}|24R, 6D
|rowspan=2 {{Party shading/Republican}}|35R, 25D
|rowspan=6 {{Party shading/Democratic}}|[[Richard L. Neuberger]] (D)<ref>Died in office March 9, 1960.</ref>
|rowspan=18 {{Party shading/Democratic}}|Wayne Morse (D)<ref>Changed party affiliation from Independent to Democratic in 1955.</ref>
|rowspan=2 {{Party shading/Republican}}|3R, 1D
|-
!1956
|{{Party shading/Republican}}|<small>[[Elmo Smith]] (R)<ref>Succeeded to office February 1, 1956.</ref></small>
|-
!1957
|rowspan=2 {{Party shading/Democratic}}|[[Robert D. Holmes]] (D)
|rowspan=2 {{Party shading/Republican}}|[[Mark Hatfield]] (R)<ref>Resigned on January 12, 1959, after election as governor.</ref>
|rowspan=2 bgcolor=#D8BFD8|15D, 15R<ref>After 11 days of tied votes over organization of the chamber, one the twelfth day the two parties elected Democrat Boyd Overhulse as President, and organized the chamber on a bipartisan basis. [http://tbv.stparchive.com/Archive/TBV/TBV11091978P03.php] [https://news.google.com/newspapers?nid=1310&dat=19760425&id=GKhVAAAAIBAJ&sjid=_OADAAAAIBAJ&pg=4978,6626799&hl=en] [http://pamplinmedia.com/msp/131-features/232993-96960-overhulse-documents-donated-to-museum]</ref>
|rowspan=2 {{Party shading/Democratic}}|37D, 23R
|rowspan=5 {{Party shading/Democratic}}|3D, 1R
|-
!1958
|-
!1959
|rowspan=9 {{Party shading/Republican}}|Mark Hatfield (R)
|rowspan=7 {{Party shading/Republican}}|[[Howell Appling, Jr.]] (R)<ref>Appointed to office January 12, 1959. Subsequently elected in 1960.</ref>
|rowspan=3 {{Party shading/Democratic}}|19D, 11R
|rowspan=3 {{Party shading/Democratic}}|33D, 27R
|-
!rowspan=2|1960
|rowspan=6 {{Party shading/Republican}}|[[Howard C. Belton]] (R)<ref>Appointed to office January 4, 1960. Subsequently elected in 1960.</ref>
|rowspan=5 {{Party shading/Republican}}|Richard Nixon and [[Henry Cabot Lodge Jr.]] (R) {{nay}}
|-
|{{Party shading/Democratic}}|<small>[[Hall S. Lusk]] (D)<ref>Appointed to office March 16, 1960. Never elected.</ref></small>
|-
!1961
|rowspan=8|[[Leon P. Minear]] (NP)<ref>Appointed to office February 1, 1961. Subsequently elected in 1966.</ref><ref>No election for Superintendent of Public Instruction held in 1962, due to legislative statute making the office appointive. Elections resumed in 1966 after the [[Oregon Supreme Court]] overturned the statute in 1965.</ref><ref>Resigned March 31, 1968.</ref>
|rowspan=2 {{Party shading/Democratic}}|20D, 10R
|rowspan=4 {{Party shading/Democratic}}|31D, 29R
|rowspan=6 {{Party shading/Democratic}}|[[Maurine Neuberger]] (D)
|rowspan=2 {{Party shading/Coalition}}|2D, 2R
|-
!1962
|-
!1963
|rowspan=2 {{Party shading/Democratic}}|21D, 9R
|rowspan=4 {{Party shading/Democratic}}|3D, 1R
|-
!1964
|rowspan=4 {{Party shading/Democratic}}|[[Lyndon Johnson]] and [[Hubert Humphrey]] (D) {{aye}}
|-
!1965
|rowspan=2 {{Party shading/Republican}}|[[Tom McCall]] (R)<ref>Resigned on January 9, 1967, after election as governor.</ref>
|rowspan=11 {{Party shading/Democratic}}|[[Robert W. Straub]] (D)
|rowspan=6 {{Party shading/Democratic}}|19D, 11R
|rowspan=2 {{Party shading/Republican}}|33R, 27D
|-
!1966
|-
!1967
|rowspan=12 {{Party shading/Republican}}|Tom McCall (R)
|rowspan=14 {{Party shading/Republican}}|[[H. Clay Myers, Jr.|Clay Myers]] (R)<ref>Appointed to office January 9, 1967. Subsequently elected in 1968.</ref>
|rowspan=7 {{Party shading/Republican}}|38R, 22D
|rowspan=39 {{Party shading/Republican}}|Mark Hatfield (R)
|rowspan=12 {{Party shading/Coalition}}|2D, 2R
|-
!rowspan=3|1968
|rowspan=12 {{Party shading/Republican}}|Richard Nixon and [[Spiro Agnew]] (R) {{aye}}
|-
|<small>[[Jesse V. Fasold]] (NP)<ref>Appointed to office April 8, 1968. Never elected.</ref><ref>Resigned June 30, 1968.</ref></small>
|-
|rowspan=8|[[Dale Parnell]] (NP)<ref>Appointed to office July 1, 1968. Subsequently elected in 1968.</ref><ref>Resigned March 31, 1974.</ref>
|-
!rowspan=2|1969
|rowspan=5 {{Party shading/Democratic}}|16D, 14R
|-
|rowspan=9 {{Party shading/Republican}}|[[Lee Johnson (Oregon judge)|Lee Johnson]] (R)
|rowspan=33 {{Party shading/Republican}}|[[Bob Packwood]] (R)<ref>Resigned October 1, 1995.</ref>
|-
!1970
|-
!1971
|rowspan=2 {{Party shading/Republican}}|34R, 26D
|-
!1972
|-
!1973
|rowspan=5 {{Party shading/Democratic}}|[[James Redden]] (D)
|rowspan=3 {{Party shading/Democratic}}|18D, 12R
|rowspan=3 {{Party shading/Democratic}}|33D, 27R
|-
!rowspan=2|1974
|-
|<small>Jesse V. Fasold (NP)<ref>Appointed to office April 1, 1974. Never elected.</ref></small>
|-
!1975
|rowspan=4 {{Party shading/Democratic}}|Robert W. Straub (D)
|rowspan=4 {{Party shading/Democratic}}|[[Bill Stevenson (politician)|Bill Stevenson]] (D)
|rowspan=18|[[Verne Duncan|Verne A. Duncan]] (NP)<ref>Resigned November 15, 1989.</ref>
|rowspan=2 {{Party shading/Democratic}}|22D, 7R, 1I
|rowspan=2 {{Party shading/Democratic}}|38D, 22R
|rowspan=7 {{Party shading/Democratic}}|4D
|-
!1976
|rowspan=4 {{Party shading/Republican}}|[[Gerald Ford]] and [[Bob Dole]] (R) {{nay}}
|-
!1977
|rowspan=10 {{Party shading/Republican}}|[[Norma Paulus]] (R)
|rowspan=4 {{Party shading/Democratic}}|James Redden (D)<ref>Resigned March 24, 1980.</ref>
|rowspan=9 {{Party shading/Republican}}|[[H. Clay Myers, Jr.|Clay Myers]] (R)<ref>Resigned April 1, 1984.</ref>
|rowspan=2 {{Party shading/Democratic}}|24D, 6R<ref>The Independent from the 1975 session switched to Democrat.</ref>
|rowspan=2 {{Party shading/Democratic}}|37D, 23R
|-
!1978
|-
!1979
|rowspan=10 {{Party shading/Republican}}|[[Victor G. Atiyeh]] (R)
|rowspan=20 {{Party shading/Democratic}}|[[Mary Wendy Roberts]] (D)
|rowspan=3 {{Party shading/Democratic}}|23D, 7R
|rowspan=3 {{Party shading/Democratic}}|34D, 26R
|-
!rowspan=2|1980
|rowspan=11 {{Party shading/Republican}}|[[Ronald Reagan]] and [[George H. W. Bush]] (R) {{aye}}
|-
|{{Party shading/Democratic}}|<small>[[James M. Brown]] (D)<ref>Appointed to office March 24, 1980. Never elected.</ref></small>
|-
!1981
|rowspan=14 {{Party shading/Republican}}|[[David B. Frohnmayer]] (R)<ref>Resigned December 31, 1991.</ref>
|rowspan=2 {{Party shading/Democratic}}|22D, 8R
|rowspan=2 {{Party shading/Democratic}}|33D, 27R
|rowspan=2 {{Party shading/Democratic}}|3D, 1R
|-
!1982
|-
!1983
|rowspan=3 {{Party shading/Democratic}}|21D, 9R
|rowspan=3 {{Party shading/Democratic}}|36D, 24R
|rowspan=10 {{Party shading/Democratic}}|3D, 2R
|-
!rowspan=2|1984
|-
|rowspan=4 {{Party shading/Republican}}|[[Bill Rutherford (politician)|Bill Rutherford]] (R)<ref>Appointed to office April 1, 1984. Subsequently elected in 1984.</ref><ref>Resigned July 9, 1987.</ref>
|-
!1985
|rowspan=8 {{Party shading/Democratic}}|[[Barbara Roberts]] (D)<ref>Resigned on January 14, 1991, after election as governor.</ref>
|rowspan=3 {{Party shading/Democratic}}|18D, 12R
|rowspan=3 {{Party shading/Democratic}}|34D, 26R
|-
!1986
|-
!rowspan=2|1987
|rowspan=6 {{Party shading/Democratic}}|[[Neil Goldschmidt]] (D)
|-
|rowspan=7 {{Party shading/Republican}}|[[Tony Meeker]] (R)<ref>Appointed to office July 9, 1987. Subsequently elected in 1988.</ref>
|rowspan=2 {{Party shading/Democratic}}|17D, 13R
|rowspan=2 {{Party shading/Democratic}}|31D, 29R
|-
!1988
|rowspan=5 {{Party shading/Democratic}}|[[Michael Dukakis]] and [[Lloyd Bentsen]] (D) {{nay}}
|-
!1989
|rowspan=3 {{Party shading/Democratic}}|19D, 11R
|rowspan=3 {{Party shading/Democratic}}|32D, 28R
|-
!rowspan=2|1990
|<small>[[John Erickson (Oregon politician)|John Erickson]] (NP)<ref>Appointed to office December 18, 1989. Never elected.</ref><ref>Resigned September 30, 1990.</ref></small>
|-
|rowspan=10|Norma Paulus (NP/R)<ref>Appointed to office October 1, 1990, after election in 1990 but before normal commencement of term.</ref>
|-
!1991
|rowspan=4 {{Party shading/Democratic}}|Barbara Roberts (D)
|rowspan=10 {{Party shading/Democratic}}|[[Phil Keisling]] (D)<ref>Appointed to office January 14, 1991. Subsequently elected in 1992.</ref><ref>Resigned November 8, 1999.</ref>
|rowspan=2 {{Party shading/Democratic}}|20D, 10R
|rowspan=2 {{Party shading/Republican}}|31R, 29D
|rowspan=4 {{Party shading/Democratic}}|4D, 1R
|-
!1992
|{{Party shading/Republican}}|<small>[[Charles Crookham|Charles S. Crookham]] (R)<ref>Appointed to office January 2, 1992. Never elected.</ref></small>
|rowspan=9 {{Party shading/Democratic}}|[[Bill Clinton]] and [[Al Gore]] (D) {{aye}}
|-
!1993
|rowspan=5 {{Party shading/Democratic}}|[[Ted Kulongoski]] (D)
|rowspan=9 {{Party shading/Democratic}}|[[Jim Hill (Oregon politician)|Jim Hill]] (D)
|rowspan=2 {{Party shading/Democratic}}|16D, 14R
|rowspan=2 {{Party shading/Republican}}|32R, 28D
|-
!1994
|-
!1995
|rowspan=9 {{Party shading/Democratic}}|[[John Kitzhaber]] (D)
|rowspan=5 {{Party shading/Republican}}|[[Jack Roberts (Oregon politician)|Jack Roberts]] (R)
|rowspan=3 {{Party shading/Republican}}|19R, 11D
|rowspan=3 {{Party shading/Republican}}|33R, 27D
|rowspan=3 {{Party shading/Democratic}}|3D, 2R
|-
!rowspan=2|1996
|-
| rowspan="29" {{Party shading/Democratic}} |'''[[Ron Wyden]] (D)'''<ref>First elected in special election.</ref>
|-
!1997
|rowspan=13 {{Party shading/Democratic}}|[[Hardy Myers]] (D)
|rowspan=2 {{Party shading/Republican}}|20R, 10D
|rowspan=2 {{Party shading/Republican}}|31R, 29D
|rowspan=13 {{Party shading/Republican}}|[[Gordon H. Smith|Gordon Smith]] (R)
| rowspan="28" {{Party shading/Democratic}} |'''4D, 1R'''
|-
!1998
|-
!1999
|rowspan=4|Jack Roberts (NP/R)<ref>Office converted from partisan to nonpartisan by the 1995 Legislative Assembly.</ref>
|rowspan=4|[[Stan Bunn]] (NP/R)
|rowspan=2 {{Party shading/Republican}}|17R, 13D
|rowspan=2 {{Party shading/Republican}}|34R, 25D, 1I
|-
!2000
|rowspan=10 {{Party shading/Democratic}}|[[Bill Bradbury]] (D)<ref>Appointed to office November 8, 1999. Subsequently elected in 2000.</ref>
|rowspan=4 {{Party shading/Democratic}}|Al Gore and [[Joe Lieberman]] (D) {{nay}}
|-
!2001
|rowspan=9 {{Party shading/Democratic}}|[[Randall Edwards (politician)|Randall Edwards]] (D)
|rowspan=2 {{Party shading/Republican}}|16R, 14D
|rowspan=2 {{Party shading/Republican}}|32R, 27D, 1I
|-
!2002
|-
!2003
|rowspan=9 {{Party shading/Democratic}}|Ted Kulongoski (D)
|rowspan=6|[[Dan Gardner (Oregon politician)|Dan Gardner]] (NP/D)<ref>Resigned April 7, 2008.</ref>
|rowspan=10|[[Susan Castillo]] (NP/D)<ref>Resigned June 29, 2012.</ref>
|rowspan=2 bgcolor=#D8BFD8|15D, 15R<ref>A power-sharing agreement was negotiated, with Democrats choosing [[Peter Courtney]] to be the President, Republicans choosing [[Lenn Hannon]] as President Pro Tempore, and all committees and chairmanships split evenly between the parties.</ref>
|rowspan=2 {{Party shading/Republican}}|35R, 25D
|-
!2004
|rowspan=4 {{Party shading/Democratic}}|[[John Kerry]] and [[John Edwards]] (D) {{nay}}
|-
!2005
|rowspan=2 {{Party shading/Democratic}}|17D, 11R
|rowspan=2 {{Party shading/Republican}}|33R, 27D
|-
!2006
|-
!2007
|rowspan=3 {{Party shading/Democratic}}|19D, 11R
|rowspan=3 {{Party shading/Democratic}}|31D, 29R
|-
!rowspan=2|2008
|rowspan=10 {{Party shading/Democratic}}|[[Barack Obama]] and [[Joe Biden]] (D) {{aye}}
|-
| rowspan="12" |'''[[Brad Avakian]] (NP/D)'''<ref>Appointed to office April 8, 2008. Subsequently elected in 2008.</ref>
|-
!2009
|rowspan=7 {{Party shading/Democratic}}|[[Kate Brown]] (D)
|rowspan=3 {{Party shading/Democratic}}|[[John Kroger]] (D)
|{{Party shading/Democratic}}|<small>[[Ben Westlund]] (D)<ref>Died in office March 7, 2010. {{cite news|url=http://www.oregonlive.com/politics/index.ssf/2010/03/ted_wheeler_to_become_oregon_t.html|title=Governor Ted Kulongoski names Ted Wheeler as next Oregon treasurer|date=March 9, 2010|last=Mapes|first=Jeff|work=[[The Oregonian]]|access-date=March 9, 2010}}</ref></small>
|rowspan=2 {{Party shading/Democratic}}|18D, 12R
|rowspan=2 {{Party shading/Democratic}}|36D, 24R
| rowspan="15" {{Party shading/Democratic}} |'''[[Jeff Merkley]] (D)'''
|-
!2010
|rowspan=8 {{Party shading/Democratic}}|[[Ted Wheeler]] (D)<ref>Appointed to office March 11, 2010. {{cite news|url=http://www.oregonlive.com/politics/index.ssf/2010/03/ted_wheeler_to_become_oregon_t.html|title=Governor Ted Kulongoski names Ted Wheeler as next Oregon treasurer|date=March 9, 2010|last=Mapes|first=Jeff|work=[[The Oregonian]]|access-date=March 9, 2010}}</ref>
|-
!2011
|rowspan=5 {{party shading/Democratic}}|John Kitzhaber (D)<ref>Won re-election to fourth term in 2014 but resigned on February 13, 2015 effective February 18, 2015</ref>
|rowspan=4 {{party shading/Democratic}}|16D, 14R
|rowspan=2  bgcolor=#D8BFD8|30D, 30R<ref>A power-sharing agreement was negotiated, with Democrats choosing [[Arnie Roblan]] to be their Co-Speaker, Republicans choosing [[Bruce Hanna]] as their Co-Speaker, and all committees and chairmanships split evenly between the parties.</ref>
|-
!2012
| rowspan="12" {{party shading/Democratic}} |'''[[Ellen Rosenblum]]{{nbsp}}(D)'''<ref>Appointed to office June 29, 2012.{{cite news|url=http://www.oregonlive.com/politics/index.ssf/2012/06/oregon_gov_john_kitzhaber_name_2.html|title=Oregon Gov. John Kitzhaber names Ellen Rosenblum as interim attorney general|date=June 6, 2012|last=Cole|first=Michelle|newspaper=The Oregonian}}</ref>
| rowspan="12" style="background:#C3B091" |<ref>Elected position eliminated by state law. Governor serves as Superintendent and appoints a deputy to oversee the duties of the office.{{cite web|url=http://www.leg.state.or.us/11reg/measures/sb0500.dir/sb0552.en.html|title=Senate Bill 552 (text): Relating to Superintendent of Public Instruction|publisher=Oregon Legislative Assembly|access-date=June 28, 2011|archive-url=https://web.archive.org/web/20110914030049/http://www.leg.state.or.us/11reg/measures/sb0500.dir/sb0552.en.html|archive-date=September 14, 2011|url-status=dead}}</ref>
|-
!2013
|rowspan=2 {{party shading/Democratic}}|34D, 26R
|-
!2014
|-
!rowspan=2|2015
|rowspan=3 {{party shading/Democratic}}|18D, 12R
|rowspan=5 {{party shading/Democratic}} |35D, 25R
|-
| rowspan="8" {{party shading/Democratic}} |'''Kate Brown (D)'''<ref>Ascended to the office following the resignation of [[John Kitzhaber]]</ref>
|rowspan=2 {{party shading/Democratic}}|[[Jeanne Atkins]] (D)<ref>Appointed to replace Kate Brown</ref>
|-
!2016
| rowspan=5 {{Party shading/Democratic}} |[[Hillary Clinton]] and [[Tim Kaine]] (D) {{nay}}
|-
!2017
| rowspan="3" {{Party shading/Republican}} |[[Dennis Richardson (politician)|Dennis Richardson]] (R)<ref>Died in office February 26, 2019.</ref>
| rowspan="6" {{Party shading/Democratic}} |'''[[Tobias Read]] (D)'''
| rowspan=2 {{party shading/Democratic}} |17D, 13R
|-
!2018
|-
!rowspan=2|2019
| rowspan="4" |'''[[Val Hoyle]]'''
'''(NP/D)'''<ref>{{Cite web|url=https://sos.oregon.gov/elections/Documents/results/november-2018-official-results.pdf|title=2018 Oregon Election Results}}</ref><br />
| rowspan="4" {{party shading/Democratic}} |'''18D, 12R'''
| rowspan="3" {{party shading/Democratic}} |38D, 22R
|-
| rowspan="2" {{Party shading/Republican}} |[[Beverly Clarno]] (R)<ref>Appointed to fill vacancy following Richardson's death. [https://www.opb.org/news/article/oregon-secretary-of-state-bev-clarno-dennis-richardson/]</ref>
|-
!2020
| rowspan="2" {{party shading/Democratic}} | [[Joe Biden]] and [[Kamala Harris]] (D) {{aye}}
|-
!2021
|{{party shading/Democratic}}|'''[[Shemia Fagan]] (D)'''
|{{party shading/Democratic}}|'''37D, 23R'''
|-
!rowspan=2|Year!![[List of Governors of Oregon|Governor]]!![[Oregon Secretary of State|Secretary of State]]!![[Oregon Attorney General|Attorney General]]!![[Oregon State Treasurer|Treasurer]]!![[Oregon Bureau of Labor and Industries|Comm. of Labor]]!![[Oregon Superintendent of Public Instruction|Supt. of Pub. Inst.]]!![[Oregon State Senate|State Senate]]!![[Oregon House of Representatives|State House]]!![[List of United States Senators from Oregon#Class II|U.S. Senator (Class II)]]!![[List of United States Senators from Oregon#Class III|U.S. Senator (Class III)]]!![[List of United States Representatives from Oregon|U.S. House]]!!rowspan=2|[[United States presidential election|Electoral College votes]]
|-
!colspan=6|Executive offices!!colspan=2|[[Oregon Legislative Assembly|Legislative Assembly]]!!colspan=3|[[United States congressional delegations from Oregon|United States Congress]]
|}

==Notes and references==
{{reflist|30em}}

==See also==
*[[Oregon#Politics|Politics in Oregon]]
*[[Politics of Oregon]]
*[[Elections in Oregon]]

{{Political party strength in U.S. states}}

{{DEFAULTSORT:Political Party Strength In Oregon}}
[[Category:Politics of Oregon]]
[[Category:Political party strength by state in the United States|Oregon]]