McDonough County, Illinois
Founding: 1830 (declared in 1826) Parent county: Unorganized territory Namesake: Thomas MacDonough, U.S. naval officer Seat: Macomb (1830–) Land area: 589 square miles Population (2020): 27,238 Population (historic): 5,308 (1840); 20,069 (1860); 27,970 (1880); 28,412 (1900); 27,329 (1930) Periods of population growth: pre-1840–1880; 1890s; 1910–1930; 1940–1980 Subdivisions: Three cities; seven villages; two CDPs; 18 townships Pre-1940 residences (estimated): 4,218 (29.2%) Pre-1940 housing survival rate: 48.5% Pre-1860 housing survival rate (1940): 8.1% Farm housing in disrepair (1950): 6.2% Nonfarm housing in disrepair (1950): 7.5% Average farmhouse value (1930): $1,977 Average outbuilding value (1930): $1,964 Average farmhouse size (1940): 6.5 rooms Number of farms (1920): 2,728 Average farm size (1920): 106 acres Sources of settlement: Ohio, ...