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

National Register listings: 21

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. *Powell Farm (c. 1880). 24318 Centennial Road. English. Second Empire.
2. *David Pritchett Farm (1869). 31450 Pike Road. Fidelity. Italianate.
3. *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. *Henry Ryan Farm (1868). 32786 Kane Road. Ruyle.
8. *William Ruyle Farm (1872). Kane Road, at Smith Road. Ruyle. Italianate.