Calhoun County, Iowa

Founding: 1855 (declared in 1851)
Parent county: Unorganized territory
Namesake: John Calhoun, South Carolina politician
Seat: Lake City (1856–1877); Rockwell City (1877–)
Land area: 570 square miles
Population (2020): 9,927
Population (historic): 1,602 (1870); 13,107 (1890); 17,090 (1910); 17,605 (1930)
Periods of population growth: 1860–1900; 1910s; 2010s
Subdivisions: 12 cities; 16 townships
National Register listings: 15
Pre-1940 residences (estimated): 1,820 (35.9%)
Pre-1940 housing survival rate: 46.7%

Farm housing in disrepair (1950): 3.3%

Nonfarm housing in disrepair (1950): 5.7%

Average farmhouse value (1930): $2,322
Average outbuilding value (1930): $2,902
Average farmhouse size (1940): 6.8 rooms
Number of farms (1920): 2,060
Average farm size (1920): 160.3 acres
Sources of settlement: Iowa, Illinois, Germany, Sweden, and New York
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Rockwell City

 
Namesake: John Rockwell, owner of the city site
Founding: 1876 (platting); 1877 (post office); 1882 (incorporation)
Population (2020): 2,240
Population (historic): 90 (1880); 1,222 (1900); 2,108 (1930)
Periods of population growth: 1876–1940; 1960s; 1990s; 2010s
Pre-1940 residences (estimated): 339 (35.5%)
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