Washington County, Pennsylvania

Founding: 1781
Parent county: Westmoreland

Namesake: George Washington, U.S. president
Seat: Washington (1781–)

Land area: 867 square miles

Population (2020): 209,349

Population (historic): 23,892 (1790); 42,784 (1830); 48,483 (1870); 92,181 (1900); 204,802 (1930)

Periods of population growth: pre-1790–1830; 1840–1940; 1950s; 1970s; 2000–2020

Subdivisions: Two cities; 32 boroughs; 32 CDPs; 34 townships

Pre-1940 residences (estimated): 25,250 (26.5%)
Pre-1940 housing survival rate: 52.5%
Pre-1860 housing survival rate (1940): 27.7%

Farm housing in disrepair (1950): 8.9%

Nonfarm housing in disrepair (1950): 8.3%
Average farmhouse value (1930): $2,454
Average outbuilding value (1930): $1,704
Average farmhouse size (1940): 6.1 rooms
Number of farms (1920): 4,482
Average farm size (1920): 89.1 acres
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Washington

Namesake: George Washington, U.S. president

Founding: 1781 (platting); 1794 (post office); 1810 (incorporation)

Population (2020): 13,176

Population (historic): 1,301 (1810); 2,062 (1840); 3,571 (1870); 7,670 (1900); 24,545 (1930)

Periods of population growth: pre-1810–1860; 1870–1950
Pre-1940 residences (estimated): 3,157 (47.5%)
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