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
National Register listings: 15
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)
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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Outstanding Buildings

  1. *Bartlett Hoit Farm (c. 1850). 11514 US Highway 6. Edford. Greek Revival.
  2. Maplewood / Richard Owens House (c. 1870). 8 Maplewood Drive. Geneseo. Italianate.
  3. Peter Hanna Farm (c. 1865). 7766 Quarry Road. Hanna. Gothic Revival.
  4. *Frederick Francis House (1889–1890). 29862 900th Road. Kewanee. Eclectic/Romanesque.
  5. *Wilder Warner House (1895). 17780 Warner Castle Road. Western. Romanesque/Queen Anne.













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