Henry County, Iowa

Founding: 1836
Parent county: Des Moines

Namesake: Disputed—perhaps Henry Dodge, Wisconsin politician
Seat: Mount Pleasant (1836–)

Land area: 434 square miles

Population (2020): 20,482

Population (historic): 8,707 (1850); 21,463 (1870); 18,895 (1890); 18,640 (1910); 17,660 (1930)

Periods of population growth: pre-1850–1870; 1890s; 1930–1950; 1970–2000; 2010s

Subdivisions: Ten cities; 12 townships

National Register listings: 54

Pre-1940 residences (estimated): 2,731 (32.7%)
Pre-1940 housing survival rate: 55.3%
Pre-1860 housing survival rate (1940): 4.4%

Farm housing in disrepair (1950): 5.5%

Nonfarm housing in disrepair (1950): 4.5%

Average farmhouse value (1930): $2,475
Average outbuilding value (1930): $2,029
Average farmhouse size (1940): 6.9 rooms
Number of farms (1920): 1,989
Average farm size (1920): 101.1 acres
Sources of settlement: Ohio, Pennsylvania, Indiana, Illinois, New York, Sweden, Virginia, and Germany
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Mount Pleasant

Namesake: A descriptive name

Founding: 1836 (platting); 1838 (post office); 1842 (incorporation)

Population (2020): 8,668

Population (historic): 758 (1850); 4,245 (1870); 3,997 (1890); 3,874 (1910); 3,743 (1930)

Periods of population growth: 1836–1880; 1890s; 1910s; 1930–1960; 1980–2000; 2010s
Pre-1940 residences (estimated): 886 (25.8%)
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