DeWitt County, Illinois
Founding: 1839 Parent counties: Macon and McLean Namesake: DeWitt Clinton, New York governor Seat: Clinton (1839–) Land area: 398 square miles Population (2020): 15,516 Population (historic): 3,247 (1840); 10,820 (1860); 17,010 (1880); 18,972 (1900); 18,598 (1930) Periods of population growth: pre-1840–1900; 1910s; 1950s; 1970s; 1990s Subdivisions: Two cities; five villages; 13 townships National Register listings: Two Pre-1940 residences (estimated): 2,390 (31.6%) Pre-1940 housing survival rate: 50.4% Pre-1860 housing survival rate (1940): 6.7% Farm housing in disrepair (1950): 5.6% Nonfarm housing in disrepair (1950): 5.7% Average farmhouse value (1930): $1,918 Average outbuilding value (1930): $2,138 Average farmhouse size (1940): 6.2 rooms Number of farms (1920): 1,586 Average farm size (1920): 141.7 acres Sources of settlement: Ohio, Indiana, Kentucky, and Ireland ____________________________________________________________________