Calhoun County, Illinois

Founding: 1825
Parent county: Pike

Namesake: John Calhoun, South Carolina senator
Seat: Gilead (1825–1847); Hardin (1847–)

Land area: 254 square miles

Population (2020): 4,437

Population (historic): 1,090 (1830); 5,144 (1860); 7,467 (1880); 8,917 (1900); 8,034 (1930)

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

Subdivisions: Five villages

National Register listings: Seven

Pre-1940 residences (estimated): 788 (27.5%)
Pre-1940 housing survival rate: 32.8%
Pre-1860 housing survival rate (1940): 4.3%

Farm housing in disrepair (1950): 12.7%

Nonfarm housing in disrepair (1950): 12.8%

Average farmhouse value (1930): $1,273
Average outbuilding value (1930): $879

Average farmhouse size (1940): 4.6 rooms
Number of farms (1920): 1,119
Average farm size (1920): 74.7 acres
Sources of settlement: Germany and Missouri
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Hardin

Namesake: John Hardin, Illinois politician

Founding: 1847 (platting); 1848 (post office); 1880 (incorporation)

Population (2020): 801

Population (historic): 300 (1880); 494 (1900); 733 (1930)

Periods of population growth: pre-1880–1960
Pre-1940 residences (estimated): 118 (23.7%)
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Outstanding Buildings

1. *Charles Kinder House (c. 1865). 401 West Main Street.
2. *John Shaw Log House (c. 1825). Mississippi River Road, north of Hamburg.
3. House (c. 1870). 552 Meyer Lane.