Washington County, Iowa

Founding: 1838
Parent counties: Henry, Louisa, Muscatine, and unorganized territory

Namesake: George Washington, U.S. president
Seat: Astoria (1838–1839); Washington (1839–)

Land area: 569 square miles

Population (2020): 22,565

Population (historic): 4,957 (1850); 18,952 (1870); 18,468 (1890); 19,925 (1910); 19,822 (1930)

Periods of population growth: pre-1850–1880; 1890s; 1910s; 1930s; 1970s; 1990–2020

Subdivisions: Nine cities; 15 townships

Pre-1940 residences (estimated): 3,422 (35.3%)
Pre-1940 housing survival rate: 58.6%
Pre-1860 housing survival rate (1940): 5.2%

Farm housing in disrepair (1950): 9%

Nonfarm housing in disrepair (1950): 8%

Average farmhouse value (1930): $2,682
Average outbuilding value (1930): $3,094
Average farmhouse size (1940): 6.7 rooms
Number of farms (1920): 2,307
Average farm size (1920): 120.1 acres
Sources of settlement: Ohio, Pennsylvania, Illinois, Germany, New York, Czechoslovakia, and Ireland
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Washington

Namesake: George Washington, U.S. president

Founding: 1839 (platting); 1839 (post office); 1852 (incorporation)

Population (2020): 7,352

Population (historic): 2,575 (1870); 3,235 (1890); 4,380 (1910); 4,814 (1930)

Periods of population growth: 1839–1990; 2000–2020
Pre-1940 residences (estimated): 1,238 (36.5%)
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