Henderson County, Illinois

Founding: 1841
Parent county: Warren

Namesake: Richard Henderson, North Carolina explorer
Seat: Oquawka (1841–)

Land area: 379 square miles

Population (2020): 6,387

Population (historic): 4,612 (1850); 12,582 (1870); 9,876 (1890); 9,724 (1910); 8,778 (1930)

Periods of population growth: pre-1850–1870; 1890s; 1910s; 1930s; 1960–1980; 1990s

Subdivisions: One city; eight villages; 11 townships

National Register listings: Four

Pre-1940 residences (estimated): 1,182 (30.6%)
Pre-1940 housing survival rate: 41.4%
Pre-1860 housing survival rate (1940): 14%

Farm housing in disrepair (1950): 5.3%

Nonfarm housing in disrepair (1950): 8.5%

Average farmhouse value (1930): $2,153
Average outbuilding value (1930): $1,986

Average farmhouse size (1940): 6.6 rooms
Number of farms (1920): 1,204
Average farm size (1920): 143.4 acres
Sources of settlement: Ohio, Pennsylvania, Sweden, Indiana, New York, and Ireland
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Oquawka

Namesake: A Sauk or Fox word meaning "yellow banks"

Founding: 1836 (platting); 1836 (post office); 1857 (incorporation)

Population (2020): 1,134

Population (historic): 553 (1850); 1,370 (1870); 1,010 (1900); 777 (1930)

Periods of population growth: 1836–1860; 1930–1980; 1990s
Pre-1940 residences (estimated): 273 (34.3%)
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Outstanding Buildings

1. *William Hutchinson Farm (c. 1855). 1622 State Route 94. Biggsville. Greek Revival.
2. *Francis Gibb House (c. 1870). 1694 State Route 94. Biggsville. Italianate.
3. *South Henderson Presbyterian Church (1854). 1651 Road 1450 East. Gladstone.
4. Josiah Brokaw Farm (c. 1865). 1730 County Road 9. Raritan. Italianate.
5. Guy Welch House (c. 1870). 2236 Road 1850 East. Rozetta. Italianate.
6. Samuel Vaughan Farm (c. 1860/1910). 1293 County Road 7. Stronghurst. Italianate/Classical Revival.
7. *Peter Bainter House (c. 1870). 1477 State Route 94. Terre Haute. Italianate.