Randolph County, Illinois

Founding: 1795
Parent county: St. Clair

Namesake: Edmund Randolph, Virginia politician
Seat: Kaskaskia (1795–1844); Chester (1844–)

Land area: 576 square miles

Population (2020): 30,163

Population (historic): 3,492 (1820); 11,079 (1850); 20,859 (1870); 28,001 (1900); 29,313 (1930)

Periods of population growth: pre-1820–1880; 1890–1940; 1960–1980

Subdivisions: Three cities; 11 villages

Pre-1940 residences (estimated): 2,681 (19.2%)
Pre-1940 housing survival rate: 40.3%
Pre-1860 housing survival rate (1940): 11.1%

Farm housing in disrepair (1950): 11.3%

Nonfarm housing in disrepair (1950): 13.9%

Average farmhouse value (1930): $1,057
Average outbuilding value (1930): $895

Average farmhouse size (1940): 5.5 rooms
Number of farms (1920): 2,324
Average farm size (1920): 106.5 acres
Sources of settlement: Germany, Missouri, Ireland, and Tennessee
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Chester

Namesake: Chester, England

Founding: 1830 (founding); 1832 (post office); 1835 (incorporation)

Population (2020): 7,640

Population (historic): 1,615 (1870); 2,708 (1890); 2,747 (1910); 3,922 (1930)

Periods of population growth: pre-1870–1900; 1910–1950; 1960–1980; 1990–2010
Pre-1940 residences (estimated): 523 (22.2%)
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