Formed 20 Jan 1824, 424 square miles.
Parent counties: Coshocton, Wayne, Tuscarawas
Evolution of county from date of formation until it assumed its final form
20 Jan 1824: Erected and attached to Coshocton, Tuscarawas, and Wayne until organization
4 Jan 1825: Organized
Federal Population schedules extant from 1820-1940. (1890 missing) Part of Holmes County was Washington County in 1800. Washington County's census exists.
Non-population schedules:1820 Manufacturers (part of Wayne, Coshocton, and Tuscarawas); 1850 Agricultural; 1850 Industry; 1850 Mortality; 1860 Agricultural, 1860 Mortality; 1870 Agricultural; 1870 Industry; 1880 Agricultural; 1880 Defective, Dependent, and Delinquent
Berlin, Clark, Hardy, Killbuck, Knox, Mechanic, Monroe, Paint, Prairie, Richland, Ripley, Salt Creek, Walnut Creek, and Washington.
Jana Broglin, CG, OGSF