Formed 21 Dec 1815, 456 square miles.
Parent counties: Gallia and Scioto
Evolution of county from date of formation until it assumed its final form
21 Dec 1815: Erected and attached to Scioto and Gallia
1 Mar 1817: Organized. Part of Scioto attached
1 Mar 1818: Part attached to Scioto
22 Dec 1818: Part of Gallia attached
1 Mar 1826: Part attached to Scioto
1 Apr 1839: Part attached to Gallia
11 Feb 1840: Part of Gallia attached and part attached to Gallia
From 1815-1852, the county seat was located in Burlington. In 1852 it was moved to Ironton.
Federal Population schedules extant from 1800, 1820-1940. (1890 missing)
1820 Manufacturers; 1850 Agricultural; 1850 Industry; 1850 Mortality; 1860 Agricultural, 1860 Mortality; 1870 Agricultural; 1880 Agricultural; 1880 Defective, Dependent, and Delinquent
Aid, Decatur, Elizabeth, Fayette, Hamilton, Lawrence, Mason, Perry, Rome, Symmes, Union, Upper, Washington, and Windsor.
Jana Broglin, OGSF