Washington County, Location

Washington County

Formed 27 Jul 1788, 641 square miles
Parent county: Original county

Evolution of county from date of formation until it assumed its final form
27 Jul 1788: Erected and organized
11 Feb 1792: Diminished by extension of Hamilton
10 Jul 1797: Diminished by formation of Adams
29 Jul 1797: Diminished by formation of Jefferson
20 Aug 1798: Diminished by formation of Ross
19 Dec 1799: Part attached to Jefferson
9 Dec 1800: Diminished by formation of Fairfield
7 Sep 1801: Diminished by formation of Belmont
30 Apr 1803: Diminished by formation of Gallia
1 May 1803: Diminished by formation of Columbiana
1 Mar 1804: Diminished by formation of Muskingum
1 Mar 1805: Diminished by formation of Athens
31 Jan 1807: Part attached to Jefferson
18 Feb 1807: Part attached to Athens and part of Athens attached
1 Mar 1813: Part of Mnroe attached temporarily until organization
10 Feb 1814: Part attached to Athens and part of Athens attached
1 Mar 1815: Diminished by organization of Monroe. Part attached to Monroe
29 Dec 1817: Part of Morgan attached temporarily until organization
1 Mar 1818: Diminished by organization of Morgan
11 Mar 1845: Part attached to Morgan
14 Feb 1846: Part attached to Morgan
1 Apr 1851: Diminished by formation of Noble. Parts attached to Morgan and to Monroe

Federal Population schedules extant from 1800-1940. Washington County is the only county for which all census exists, except the 1890.

Non-population schedules:
1820 Manufacturers; 1850 Agricultural; 1850 Industry; 1850 Mortality; 1860 Industry; 1860 Mortality; 1870 Agricultural; 1870 Industry; 1880 Agricultural; 1880 Industry

Townships:
Adams, Aurelius, Barlow, Belpre, Decatur, Dunham, Fairfield, Fearing, Grandview, Independence, Lawrence, Liberty, Ludlow, Marietta, Muskingum, Newport, Palmer, Salem, Warren, Waterford, Watertown, and Wesley.