Jersey County, Illinois

Founding: 1839
Parent county: Greene

Namesake: The state of New Jersey
Seat: Jerseyville (1839–)

Land area: 369 square miles

Population (2020): 21,512

Population (historic): 4,535 (1840); 12,051 (1860); 15,542 (1880); 14,612 (1900); 12,556 (1930)

Periods of population growth: pre-1840–1880; 1930–2010

Subdivisions: Two cities; four villages; one town; 11 townships

Pre-1940 residences (estimated): 1,982 (19.6%)
Pre-1940 housing survival rate: 49.2%
Pre-1860 housing survival rate (1940): 11.6%

Farm housing in disrepair (1950): 12.4%

Nonfarm housing in disrepair (1950): 12.5%

Average farmhouse value (1930): $1,493
Average outbuilding value (1930): $1,073

Average farmhouse size (1940): 5.6 rooms
Number of farms (1920): 1,368
Average farm size (1920): 111.1 acres
Sources of settlement: Germany, Missouri, Ireland, Ohio, and New Jersey
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Jerseyville

Namesake: The state of New Jersey

Founding: 1834 (platting); 1835 (post office); 1855 (incorporation)

Population (2020): 8,337

Population (historic): 760 (1850); 2,576 (1870); 3,517 (1900); 4,309 (1930)

Periods of population growth: pre-1850–1860; 1870–1910; 1920–1980; 1990–2010
Pre-1940 residences (estimated): 1,012 (26.2%)
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Outstanding Buildings

1. Oliver Powell Farm (c. 1880). 24318 Centennial Road. English. Second Empire.
2. David Pritchett Farm (1869). 31450 Pike Road. Fidelity. Italianate.
3. Oliver Powell House (c. 1870). 24173 Centennial Road. Jersey. Italianate. Razed.
4. Cornelius Fisher Farm (1867). 24818 US Highway 67. Jersey. Italianate.
5. William Fulkerson Farm (1866). 25007 US Highway 67. Jersey. Italianate.
6. Jacob Smith Farm (c. 1861). State Route 100, east of Duncan Hill Road. Quarry.
7. William Ruyle Farm (1872). 31747 Kane Road. Ruyle. Italianate.
8. Henry Ryan Farm (1868). 32786 Kane Road. Ruyle.

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