Decatur County, Iowa
Founding: 1850 (declared in 1846) Parent county: Unorganized territory Namesake: Stephen Decatur, U.S. naval commander Seat: Decatur (1850–1853); Leon (1853–) Land area: 532 square miles Population (2020): 7,645 Population (historic): 965 (1850); 12,018 (1870); 15,643 (1890); 16,347 (1910); 14,903 (1930) Periods of population growth: pre-1850–1900; 1910s; 1990s Subdivisions: Ten cities; 16 townships Pre-1940 residences (estimated): 1,326 (34.4%) Pre-1940 housing survival rate: 34.5% Pre-1860 housing survival rate (1940): 2.3% Farm housing in disrepair (1950): 15.4% Nonfarm housing in disrepair (1950): 6.4% Average farmhouse value (1930): $1,458 Average outbuilding value (1930): $1,192 Average farmhouse size (1940): 5.9 rooms Number of farms (1920): 2,029 Average farm size (1920): 130.2 acres Sources of settlement: Ohio, Indiana, Illinois, Missouri, Pennsylvania...