Carroll County, Iowa

Founding: 1855 (declared in 1851)
Parent counties: Pottawattamie and unorganized territory
Namesake: Charles Carroll, Maryland politician
Seat: Carrollton (1855–1869); Carroll (1869–)
Land area: 569 square miles
Population (2020): 20,760
Population (historic): 281 (1860); 12,351 (1880); 20,319 (1900); 22,326 (1930)
Periods of population growth: 1860–1900; 1910–1960; 1970s
Subdivisions: 13 cities; 16 townships
National Register listings: 18
Pre-1940 residences (estimated): 2,572 (27.1%)
Pre-1940 housing survival rate: 53.3%

Farm housing in disrepair (1950): 1.9%

Nonfarm housing in disrepair (1950): 2.1%

Average farmhouse value (1930): $2,582
Average outbuilding value (1930): $3,419
Average farmhouse size (1940): 7 rooms
Number of farms (1920): 2,087
Average farm size (1920): 156.9 acres
Sources of settlement: Germany, Illinois, Ohio, and New York
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Carroll

 
Namesake: Charles Carroll, Maryland politician
Founding: 1867 (platting as Carroll City); 1867 (post office); 1869 (incorporation)
Population (2020): 10,321
Population (historic): 384 (1870); 2,448 (1890); 3,546 (1910); 4,691 (1930)
Periods of population growth: 1867–1980; 1990–2020
Pre-1940 residences (estimated): 716 (14.8%)
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