Washington County, Missouri

Founding: 1813
Parent counties: St. Louis and Ste. Genevieve

Namesake: George Washington, U.S. president
Seat: Potosi (1814–)

Land area: 760 square miles

Population (2020): 23,514

Population (historic): 2,769 (1820); 8,811 (1850); 11,719 (1870); 14,263 (1900); 14,450 (1930)

Periods of population growth: pre-1820–1900; 1910–1940; 1960–2010

Subdivisions: Two cities; two villages; 14 townships

National Register listings: 11

Pre-1940 residences (estimated): 969 (8.8%)
Pre-1940 housing survival rate: 20.8%
Pre-1860 housing survival rate (1940): 7.7%

Farm housing in disrepair (1950): 22.3%

Nonfarm housing in disrepair (1950): 24.3%

Average farmhouse value (1930): $635
Average outbuilding value (1930): $446

Average farmhouse size (1940): 4.4 rooms
Number of farms (1920): 1,527
Average farm size (1920): 59.5 acres

Sources of settlement: Tennessee, Virginia, Kentucky, Illinois, and Ireland

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Potosi

Namesake: Potosí, Bolivia

Founding: circa 1798 (founding); 1824 (post office); 1826 (incorporation)

Population (2020): 2,538

Population (historic): 548 (1860); 715 (1880); 638 (1900); 1,279 (1930)

Periods of population growth: pre-1860–1870; 1890–1960; 1980s
Pre-1940 residences (estimated): 162 (13.9%)

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Outstanding Buildings

1. *Zachary Higginbotham House (c. 1875). 15382 Cannon Mines Road. Kingston. Italianate.
2. *Mathis House (c. 1811/1929). 27053 State Route 8. Walton.