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

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
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Clinton

Namesake: DeWitt Clinton, New York governor

Founding: 1835 (platting); 1836 (post office); 1855 (incorporation)

Population (2020): 7,004

Population (historic): 367 (1850); 1,800 (1870); 2,598 (1890); 5,165 (1910); 5,920 (1930)

Periods of population growth: pre-1850–1880; 1890–1940; 1950–1980; 1990s
Pre-1940 residences (estimated): 1,115 (32.9%)
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