Black Hawk County, Iowa

Founding: 1853 (declared in 1843)
Parent county: Buchanan
Namesake: Black Hawk, Sauk chief
Seat: Sturgis Falls (1853–1855); Waterloo (1855–)
Land area: 566 square miles
Population (2020): 131,144
Population (historic): 8,244 (1860); 23,913 (1880); 32,399 (1900); 69,146 (1930)
Periods of population growth: 1850–1980; 1990–2010
Subdivisions: 11 cities; one CDP; 17 townships
National Register listings: 54
Pre-1940 residences (estimated): 11,336 (19.6%)
Pre-1940 housing survival rate: 49.9%
Pre-1860 housing survival rate (1940): 8%

Farm housing in disrepair (1950): 4.2%

Nonfarm housing in disrepair (1950): 5.1%

Average farmhouse value (1930): $2,443
Average outbuilding value (1930): $3,164
Average farmhouse size (1940): 6.8 rooms
Number of farms (1920): 2,358
Average farm size (1920): 119.9 acres
Sources of settlement: New York, Pennsylvania, Illinois, Germany, Ohio, and Wisconsin
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Waterloo

 
Namesake: Uncertain
Founding: 1845 (platting); 1851 (post office); 1855 (incorporation)
Population (2020): 67,314
Population (historic): 4,337 (1870); 6,674 (1890); 26,693 (1910); 46,191 (1930)
Periods of population growth: pre-1870–1980; 1990s
Pre-1940 residences (estimated): 7,235 (22.9%)
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Outstanding Buildings

1. Mount Hope Farm / William Wilson Farm (c. 1880). 5630 Sage Road. Bennington. Italianate.
2. John Pashby Farm (c. 1865). 9936 Cedar–Wapsipinicon Road. Union. Italianate.