Political party strength in Illinois
- Lieutenant Governor
- Secretary of State
- Attorney General
- Comptroller/ Auditor (before 1972)
The table also indicates the historical party composition in the:
- State Senate
- State House of Representatives
- State delegation to the U.S. Senate
- State delegation to the U.S. House of Representatives
Political party strength in Illinois is highly dependent upon the county. Cook County, the most populous county in Illinois and encompasses most of Chicago, is a Democratic stronghold. However, Illinois' reputation as a blue state rests upon the fact that the majority of its population and political power is concentrated in Chicago. Outside of Chicago, Illinois is a purple state. DuPage County, including the western suburbs of Chicago, on the other hand, has traditionally been a Republican stronghold, although Democrats have gained some ground in the 2012 congressional elections there. The majority of the state is mostly Republican, although the state atmosphere tends to be moderate.
Illinois' electoral college votes have gone towards the Democratic presidential candidate for the past six elections, although its congressional makeup tends to remain evenly balanced between Republicans and Democrats. For years in which a presidential election was held, the table indicates which party's nominees received the state's electoral votes.
|Year||Executive offices||General Assembly||United States Congress||Electoral College votes|
|Governor||Lieutenant Governor||Sec. of State||Attorney General||Comptroller/Auditor||Treasurer||State Senate||State House||U.S. Senator (Class 2)||U.S. Senator (Class 3)||U.S. House|
|1809||Ninian Edwards (DR)||vacant|
|Shadrach Bond (DR)||Pierre Menard (DR)|
|1823||Edward Coles (DR)||Adolphus Hubbard (DR)|
|1827||Ninian Edwards (DR)||William Kinney (DR)|
|1831||John Reynolds (D||Zadok Casey (D)|
|William Lee D. Ewing (D)|
|William Lee D. Ewing (D)||vacant|
|1835||Joseph Duncan (D)||Alexander Jenkins (D)|
|1837||William H. Davidson (D)|
|1839||Thomas Carlin (D)||Stinson Anderson|
|1843||Thomas Ford (D)||John Moore (D)|
|1847||Augustus C. French (D)||Joseph Wells (D)|
|1849||William McMurtry (D)|
|1853||Joel Aldrich Matteson (D)||Gustavus Koerner (D)|
|1857||William Henry Bissell (R)||John Wood (R)|
|John Wood (R)||Thomas Marshall (D)|
|1861||Richard Yates (R)||Francis Hoffmann (R)|
|1865||Richard James Oglesby (R)||William Bross (R)|
|1869||John M. Palmer (R)||John Dougherty (R)|
|1873||Richard James Oglesby (R)||John Lourie Beveridge (R)|
|John Lourie Beveridge (R)||John Early (R)|
|1875||Archibald A. Glenn (D)|
|1877||Shelby Moore Cullom (R)||Andrew Shuman (R)|
|1881||John Marshall Hamilton (R)|
|John Marshall Hamilton (R)||William Campbell (R)|
|1885||Richard James Oglesby (R)||John Smith (R)|
|1889||Joseph W. Fifer (R)||Lyman Ray (R)|
|1893||John Peter Altgeld (D)||Joseph B. Gill (D)||Maurice Moloney (D)|
|1897||John Riley Tanner (R)||William Northcott (R)||Edward Akin (R)|
|1901||Richard Yates (R)||Howland Hamlin (R)|
|1905||Charles S. Deneen (R)||Lawrence Sherman (R)||William H. Stead (R)|
|1909||John G. Oglesby (R)|
|1913||Edward Fitzsimmons Dunne (D)||Barratt O'Hara (D)||Patrick Lucy (D)|
|1914||Lewis G. Stevenson (D)|
|1917||Frank O. Lowden (R)||John G. Oglesby (R)||Louis L. Emmerson (R)||Edward Brundage (R)||Len Small (R)|
|1921||Len Small (R)||Fred Sterling (R)|
|1925||Oscar Carlstrom (R)|
|1926||Oscar Nelson (R)|
|1929||Louis Lincoln Emmerson (R)||William J. Stratton (R)|
|1933||Henry Horner (D)||Thomas Donovan (D)||Otto Kerner, Sr. (D)||John Cunningham Martin (D)|
|1937||John Henry Stelle (D)||John Cunningham Martin(D)|
|1939||John E. Cassidy (D)|
|John Henry Stelle (D)||vacant|
|1941||Dwight H. Green (R)||Hugh W. Cross (R)||George F. Barrett (R)|
|1945||William Stratton (R)|
|1949||Adlai Stevenson (D)||Sherwood Dixon (D)||Ivan Elliot (D)||Paul Douglas (D)|
|1951||Everett Dirksen (R)||William Stratton (R)|
|1953||William Stratton (R)||John William Chapman (R)||Latham Castle (R)||Orville E. Hodge (R)||Elmer J. Hoffman (R)|
|1959||Grenville Beardsley (R)|
|1960||William Guild (R)|
|1961||Otto Kerner, Jr. (D)||Samuel H. Shapiro (D)||William G. Clark (D)||Michael J. Howlett (D)|
|1964||Paul Powell (D)|
|1967||Adlai E. Stevenson III (D)||Charles H. Percy (R)|
|Samuel H. Shapiro (D)||vacant|
|1969||Richard B. Ogilvie (R)||Paul Simon (D)||William J. Scott (R)||Ralph Tyler Smith (R)|
|1971||Alan J. Dixon (D)||Adlai E. Stevenson III (D)|
|1973||Dan Walker (D)||Neil Hartigan (D)||Michael J. Howlett (D)||George Lindberg(R)|
|1977||James R. Thompson (R)||Dave O'Neal (R)||Alan J. Dixon (D)||Michael J. Bakalis (D)|
|1979||Roland Burris (D)||Jerome Cosentino (D)|
|1980||Tyrone C. Fahner (R)||Ronald Reagan and George H. W. Bush (R)|
|1981||Alan J. Dixon (D)|
|vacant||Jim Edgar (R)|
|1983||George Ryan (R)||Neil Hartigan (D)||James Donnewald (D)|
|1985||Paul Simon (D)||13D, 9R|
|1987||Jerome Cosentino (D)|
|1988||George H. W. Bush and Dan Quayle (R)|
|1991||Jim Edgar (R)||Robert W. Kustra (R)||George Ryan (R)||Roland Burris (D)||Dawn Clark Netsch (D)||Pat Quinn (D)||15D, 7R|
|1992||Bill Clinton and Al Gore (D)|
|1993||Carol Mosley Braun (D)||12D, 8R|
|1995||Jim Ryan (R)||Loleta Didrickson (R)||Judy Baar Topinka (R)||10D, 10R|
|1997||Richard Durbin (D)|
|1999||George Ryan (R)||Corinne Wood (R)||Jesse White (D)||Daniel Hynes (D)||Peter Fitzgerald (R)|
|2000||Al Gore and Joe Lieberman (D)|
|2003||Rod Blagojevich (D)||Pat Quinn (D)||Lisa Madigan (D)||10R, 9D|
|2004||John Kerry and John Edwards (D)|
|2005||Barack Obama (D)||10D, 9R|
|2007||Alexi Giannoulias (D)||37D, 22R||66D, 52R|
|2008||67D, 51R||Barack Obama and Joe Biden (D)|
|2009||Pat Quinn (D)||vacant||70D, 48R||Roland Burris (D)||12D, 7R|
|2011||Sheila Simon (D)||Judy Baar Topinka (R)||Dan Rutherford (R)||35D, 24R||64D, 54R||Mark Kirk (R)||11R, 8D|
|2013||40D, 19R||71D, 47R||12D, 6R|
|2015||Bruce Rauner (R)||Evelyn Sanguinetti (R)||TBD||Mike Frerichs (D)||39D, 20R||10D, 8R|
|Year||Governor||Lieutenant Governor||Sec. of State||Attorney General||Comptroller/Auditor||Treasurer||State Senate||State House||U.S. Senator (Class II)||U.S. Senator (Class III)||U.S. House||Electoral College votes|
|Executive offices||General Assembly||United States Congress|
|Gallery of Illinois election results|
- Territorial governor.
- Resigned following election to United States House of Representatives.
- As acting lieutenant governor, filled unexpired term.
- Died in office.
- Resigned so that Lieutenant Governor John Lourie Beveridge, acting as governor, would appoint him to the United States Senate.
- Resigned to take elected seat in the United States Senate.
- Resigned to take seat on the United States Court of Appeals for the Seventh Circuit.
- Appointed to fill vacancy.
- Removed from Office upon tax fraud conviction: "Ex-Illinois Attorney General Loses Tax Conviction Plea". New York Times. 20 September 1980. Retrieved on 11 Feb. 2009.
- Appointed to fill Attorney General William J. Scott's term upon Scott's removal from office.
- Initially appointed to fill vacancy; later elected in his own right.
- Impeached and removed from office by the state legislature on corruption charges.
- Resigned following election as president of the United States.
- Regarding resignations and appointments; the person who held the office for the majority of the year is listed as the office holder for that year.
- Guild III, William (September 1999). "William Guild, Sr." DCBA Brief. Retrieved on 11 Feb. 2009.
- Inventory of the Latham Castle Collection (Historical Sketch). Notes maintained by Northern Illinois University Library. Retrieved on 11 Feb. 2009.