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
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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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Outstanding Buildings

1. *John Wasson Farm (c. 1875). 1661 State Route 10. Barnett. Italianate.
2. Ollie Marsh House (c. 1895). 7498 Reagan Road. Clintonia. Queen Anne.
3. *Clifton Moore Farm (1883). 10496 Trust Road. Clintonia. Italianate.
4. *Campbell House (c. 1865). 7609 US Highway 51B. Clintonia. Italianate.
5. *John Warner House (c. 1870). 7747 US Highway 51B. Clintonia. Italianate. Razed.
6. Anthony Trenkle House (c. 1880). 26155 US Highway 150. Santa Anna. Italianate.
7. *William Brelsford House (c. 1870). 3904 State Route 54. Tunbridge. Italianate.