James Thomson
1841-1842
Whig
Dec. 18, 1790 to Aug. 10, 1876


Alexander Hay
1842-1845
Whig, Volunteer, Independent
April 8, 1806 to Nov. 5, 1882



William J. Howard
1845-1846
Whig
Dec. 31, 1799 to Oct. 2, 1862


Dr. William Kerr
1846-1847
Democrat
Gabriel Adams
1847-1849
Whig
1790 to June 5, 1864
John Herron
1849-1850
Whig


Allegheny County Officials' bonds 1853-1902, MFF #56, Detre Library & Archives at the Heinz History Center.

Joseph Barker
1850-1851
People’s and Anti-Catholic
1806 to Aug. 2, 1862



John B. Guthrie
1851-1853
Democrat
July 28, 1807 to Aug. 17, 1885

Robert M. Riddle
1853-1854
Whig
Aug. 17, 1812 to Dec. 18, 1858
Ferdinand E. Volz
1854-1856
Whig, Whig-Democratic fusion
1823 to May 1876