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

National Register listings: Nine

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.