Formed 13 Mar 1838, 264 square miles
Parent counties: Huron and Sandusky
Evolution of county from date of formation until it assumed its final form
15 Mar 1838: Erected
16 Mar 1838: Organized
6 Mar 1840: Diminished by formation of Ottawa. Part of Huron attached
8 Mar 1845: Kelly's Island attached
Federal Population schedules extant from 1820-1940. (1890 missing)
1820 Manufacturers (part of Huron); 1850 Agricultural; 180 Industry; 1860 Agricultural; 1860 Mortality; 1870 Agricultural; 1870 Industry; 1880 Agricultural; 1880 Industry; 1880 Mortality
Berlin, Florence, Groton, Huron, Margaretta, Milan, Oxford, Perkins, and Vermilion.
Archival District: Bowling Green State University, Center for Archival Collections, Jerome Library, Bowling Green Ohio.
Jana Broglin, CG, OGSF