Washington County, Ohio

Founding: 1788
Parent county: Unorganized territory

Namesake: George Washington, U.S. president
Seat: Marietta (1788–)

Land area: 632 square miles

Population (2020): 59,711

Population (historic): 5,427 (1800); 20,823 (1840); 43,244 (1880); 48,245 (1900); 42,437 (1930)

Periods of population growth: pre-1800–1880; 1890s; 1930–1980; 1990s

Subdivisions: Two cities; five villages; six CDPs; 22 townships

Pre-1940 residences (estimated): 6,164 (21.9%)
Pre-1940 housing survival rate: 52.6%
Pre-1860 housing survival rate (1940): 14.1%

Farm housing in disrepair (1950): 11.7%

Nonfarm housing in disrepair (1950): 10.8%

Average farmhouse value (1930): $963
Average outbuilding value (1930): $658
Average farmhouse size (1940): 6.1 rooms
Number of farms (1920): 4,204
Average farm size (1920): 57.6 acres
Sources of settlement: Germany, Pennsylvania, Virginia, Connecticut, New York, and Scotland
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Marietta

Namesake: Unclear—perhaps Marie Antoinette, French queen

Founding: 1788 (platting); 1794 (post office)

Population (2020): 13,385

Population (historic): 321 (1800); 3,175 (1850); 5,444 (1880); 13,348 (1900); 14,285 (1930)

Periods of population growth: 1788–1900; 1910s; 1930–1960
Pre-1940 residences (estimated): 2,913 (45.1%)
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