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

National Register listings: 22

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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Outstanding Buildings

1. Robert Griffith Farm (1856/1890s). 1546 305th Road. Clay. Italianate.
2. Edward Brinton Farm (1871). 1410 310th Road. Clay.
3. Harry Ingham Farm (c. 1860). 3205 Fir Road. Clay. Italianate.
4. William Hamilton House (c. 1895). 1391 Gingko Road. Lime Creek. Queen Anne.
5. *Elmhurst / Thomas Singmaster Farm (c. 1905). 1994 Keokuk–Washington Road. Seventy-Six. Classical Revival.