||This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (February 2010)|
|United States Senator
March 4, 1803 – January 4, 1809
|Preceded by||James Ross|
|Succeeded by||Michael Leib|
June 17, 1741|
Lurgan Township, Pennsylvania
|Died||October 5, 1811
Buffalo Township, Pennsylvania
Samuel Maclay (June 17, 1741 – October 5, 1811) was an American surveyor, farmer, and politician from Union County, Pennsylvania. He served in the state legislature and represented Pennsylvania in both the U.S. House and the United States Senate.
In 1790, Maclay performed his first state work as a surveyor of the streams of northwestern Pennsylvania. He became an associate judge of Franklin County, Pennsylvania and served between 1792 and 1975. Maclay was the father of William Plunkett Maclay.
Political life 
Maclay was elected to the Fourth Congress. He served as a member of the lower house of the State legislature in 1797 and was a member of the Pennsylvania State Senate from 1798 to 1802 and served as speaker from 1801 to 1802.
He was elected to the United States Senate as a Democratic Republican by the Pennsylvania legislature and began service in 1803. Popular among Pennsylvanians, he was an infrequent Senate speaker, but was frequently mentioned as his party's possible candidate for governor, but was passed over in favor of Simon Snyder.
Maclay opposed the nomination of James Madison to the presidency by the Democratic Republicans. He doubted how committed Madison was to the party, considering him a late convert, and backed George Clinton instead. Furthermore, Maclay was an opponent of the Embargo Act which had been passed during President Jefferson's second term. Despite the eventual repeal of the Embargo Act, Madison secured Pennsylvania's support and Maclay realized that he was out of step with his fellow party members and Pennsylvanians. Seeing no hope of reelection, he resigned from the Senate in 1809.
Maclay served in the Senate from March 4, 1803, until his resignation on January 4, 1809. He retired to Buffalo Township, Pennsylvania, where he died, aged 70. He was interred in the Driesbach Church Cemetery in Union County.
- American National Biography; Dictionary of American Biography; Aurand, A. Monroe, Jr. The Genealogy of Samuel Maclay, 1741-1811. Harrisburg, Pennsylvania: Aurand Press, 1938;
- Maclay, Samuel. Journal of Samuel Maclay. Williamsport, Pennsylvania: Gazette & Bulletin Printing House, 1887.
- Samuel Maclay at the Biographical Directory of the United States Congress
- The Political Graveyard
- Union County, Pennsylvania: A Celebration of History
|United States House of Representatives|
At large on a General ticket:
|Member of the U.S. House of Representatives
from Pennsylvania's 10th congressional district
alongside: David Bard
|United States Senate|
|United States Senator (Class 1) from Pennsylvania
Served alongside: George Logan, Andrew Gregg