Formed 29 Jan 1813, 456 square miles
Parent county: Belmont
Evolution of county from date of formation until it assumed its final form
1 Mar 1813: Erected and attached to Belmont, Washington, and Guernsey until organized
1 Mar 1815: Organized. Part of Washington attached.
24 Dec 1819: Part of Morgan attached
1 Apr 1851: Diminished by formation of Noble. Part of Washington attached.
Federal Population schedules extant from 1800, 1820-1940. (1890 missing)
1820 Manufacturers; 1850 Agricultural; 1850 Industry; 1850 Mortality; 1860 Agricultural; 1860 Mortality; 1880 Agricultural; 1880 Industry
Adams, Benton, Bethel, Center, Franklin, Green, Jackson, Lee, Malaga, Ohio, Perry, Salem, Seneca, Summit, Sunsbury, Switzerland, Washington, and Wayne.
Jana Broglin, CG, OGSF