Hamilton County, Illinois

Founding: 1821
Parent county: White

Namesake: Alexander Hamilton, Founding Father
Seat: McLeansboro (1821–)

Land area: 435 square miles

Population (2020): 7,993

Population (historic): 2,616 (1830); 6,362 (1850); 13,014 (1870); 20,197 (1900); 12,995 (1930)

Periods of population growth: pre-1830–1900; 1930s; 1970s; 1990s

Subdivisions: One city; one town; three villages; 12 townships

National Register listings: Four

Pre-1940 residences (estimated): 854 (20.8%)
Pre-1940 housing survival rate: 29%
Pre-1860 housing survival rate (1940): 2.9%

Farm housing in disrepair (1950): 15%

Nonfarm housing in disrepair (1950): 10.6%

Average farmhouse value (1930): $677
Average outbuilding value (1930): $405

Average farmhouse size (1940): 4.3 rooms
Number of farms (1920): 2,633
Average farm size (1920): 80.1 acres
Sources of settlement: Tennessee, Kentucky, and Indiana
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McLeansboro

Namesake: William McLean, platter

Founding: 1821 (platting); 1824 (post office); 1840 (incorporation)

Population (2020): 2,675

Population (historic): 221 (1850); 683 (1870); 1,355 (1890); 1,796 (1910); 2,162 (1930)

Periods of population growth: pre-1850–1950; 1970s; 1990s
Pre-1940 residences (estimated): 291 (21.5%)
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Outstanding Buildings

1. *Chester Judd House (1860). 16283 South Dahlgren Road. Dahlgren.