Hardin County, Iowa

Founding: 1853 (declared in 1851)
Parent county: Unorganized territory
Namesake: John Hardin, Illinois politician
Seat: Eldora (1853–)
Land area: 569 square miles
Population (2020): 16,878
Population (historic): 5,440 (1860); 17,807 (1880); 22,794 (1900); 22,947 (1930)
Periods of population growth: pre-1860–1900; 1910s; 1950s
Subdivisions: 12 cities; one CDP; 15 townships
National Register listings: 35
Pre-1940 residences (estimated): 3,252 (39.8%)
Pre-1940 housing survival rate: 54.7%

Farm housing in disrepair (1950): 5.7%

Nonfarm housing in disrepair (1950): 4.9%

Average farmhouse value (1930): $2,519
Average outbuilding value (1930): $3,214
Average farmhouse size (1940): 6.9 rooms
Number of farms (1920): 2,129
Average farm size (1920): 141.4 acres
Sources of settlement: Illinois, Iowa, New York, Ohio, Germany, Pennsylvania, and Indiana
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Eldora

 
Namesake: Unknown
Founding: 1853 (platting); 1853 (post office); 1869 (incorporation)
Population (2020): 2,663
Population (historic): 1,268 (1870); 1,577 (1890); 1,995 (1910); 3,200 (1930)
Periods of population growth: 1853–1880; 1890s; 1910–1940; 1950s
Pre-1940 residences (estimated): 477 (38.5%)
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