Formed 24 Mar 1803, 459 square miles
Parent county: Hamilton
Evolution of county from date of formation until it assumed its final form
1 May 1803: Erected and organized
1 Mar 1807: Diminished by formation of Miami
1 Mar 1808: Diminished by formation of Preble
7 Jan 1812: Parts attached to Miami and Darke
Federal Population schedules extant from 1820-1940. (1890 missing)
1820 Manufacturers; 1850 Agricultural; 1850 Industry; 1850 Mortality; 1860 Agricultural; 1860 Mortality; 1880 Agricultural; 1880 Industry
Butler, Clay, German, Harrison, Jackson, Jefferson, Miami, Perry, and Washington.
Dayton, Mad River, Madison, Randolph, Van Buren, and Wayne.
New! Probate files 1850-1900: FamilySearch.org
Jana Broglin, CG, OGSF