Formed 20 Feb 1805, 432 square miles
Parent counties: Greene, Franklin
Evolution of county from date of formation until it assumed its final form
1 Mar 1805: Erected and organized
1 Mar 1818: Diminished by formation of Logan and Clark. Part attached to Madison
1 Apr 1820: Cessation of any jurisdiction north of Indian Boundary Line by formation of counties therein
Champaign's first county seat was located at Springfield from 1805-1807. In 1807, it moved to its current location in Urbana. Champaign County lost land to Logan County when that county was formed.
Federal Population schedules extant from 1820-1940. (1890 missing)
1820 Manufacturers; 1850 Agricultural; 1850 Industry; 1860 Mortality; 1870 Agricultural; 1870 Industry; 1880 Agricultural; 1880 Mortality
Adams, Concord, Goshen, Harrison, Jackson, Johnson, Mad River, Rush, Salem, Union, Urbana, and Wayne.
200 N. Main St., Urbana, OH 43078
Jana Broglin, OGSF