Henry County, Illinois

Founding: 1837 (declared in 1825)
Parent county: Unorganized territory

Namesake: Patrick Henry, Virginia politician
Seat: Richmond (1837–1839); Morristown (1839–1844); Cambridge (1844–)

Land area: 823 square miles

Population (2020): 49,284

Population (historic): 1,260 (1840); 20,660 (1860); 36,597 (1880); 40,049 (1900); 43,851 (1930)

Periods of population growth: 1830–1880; 1890–1920; 1940–1980

Subdivisions: Five cities; two towns; six villages; 24 townships

Pre-1940 residences (estimated): 7,125 (32.1%)
Pre-1940 housing survival rate: 62.2%
Pre-1860 housing survival rate (1940): 10.7%

Farm housing in disrepair (1950): 4.2%

Nonfarm housing in disrepair (1950): 7.1%

Average farmhouse value (1930): $2,534
Average outbuilding value (1930): $2,772

Average farmhouse size (1940): 7.2 rooms
Number of farms (1920): 3,161
Average farm size (1920): 135.3 acres
Sources of settlement: Sweden, Pennsylvania, Germany, New York, Ohio, England, and Ireland
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Cambridge

Namesake: Uncertain—perhaps Cambridge, Massachusetts

Founding: 1844 (platting); 1844 (post office); 1853 (incorporation)

Population (2020): 2,086

Population (historic): 1,203 (1880); 1,345 (1900); 1,355 (1930)

Periods of population growth: pre-1880; 1890s; 1910–1930; 1940–1980; 1990s
Pre-1940 residences (estimated): 301 (32.3%)
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