Marion County, Illinois

Founding: 1823
Parent counties: Fayette and Jefferson

Namesake: Francis Marion, Continental Army officer
Seat: Salem (1823–)

Land area: 572 square miles

Population (2020): 37,729

Population (historic): 2,125 (1830); 6,720 (1850); 20,622 (1870); 30,446 (1900); 35,635 (1930)

Periods of population growth: pre-1830–1920; 1930s; 1970s; 1990s

Subdivisions: Four cities; ten villages; 17 townships

Pre-1940 residences (estimated): 3,681 (20.2%)
Pre-1940 housing survival rate: 30.7%
Pre-1860 housing survival rate (1940): 9.1%

Farm housing in disrepair (1950): 9.6%

Nonfarm housing in disrepair (1950): 12.3%

Average farmhouse value (1930): $820
Average outbuilding value (1930): $468

Average farmhouse size (1940): 4.6 rooms
Number of farms (1920): 3,097
Average farm size (1920): 90.7 acres
Sources of settlement: Ohio, Indiana, Tennessee, Kentucky, and Germany
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Salem

Namesake: A traditional name

Founding: 1823 (platting); 1825 (post office); 1855 (incorporation)

Population (2020): 7,282

Population (historic): 1,182 (1870); 1,493 (1890); 2,669 (1910); 4,420 (1930)

Periods of population growth: pre-1870–1940; 1950–1980; 1990s
Pre-1940 residences (estimated): 517 (15.5%)

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Outstanding Buildings

1. James Creed House (1867–1870). 285 Baker Street. Centralia. Greek Revival. Razed.
2. Eli Copple House (1872). 542 Sleepy Hollow Lane. Centralia. Italianate.
3. John Woods House (c. 1870). 1554 Woods Lane. Centralia. Greek Revival.
4. Snider House (1873). 1657 Woods Lane. Centralia.
5. Charles West Farm (c. 1860). 821 East 1st Street. Kinmundy.
6. Henry Pruden Farm (c. 1865). 7016 US Highway 50. Stevenson. Italianate.

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