St. Clair County, Missouri

Founding: 1841 (declared in 1833)
Parent counties: Lafayette and unorganized territory

Namesake: Arthur St. Clair, governor of the Northwest Territory
Seat: Osceola (1841–)

Land area: 670 square miles

Population (2020): 9,284

Population (historic): 3,556 (1850); 6,742 (1870); 16,747 (1890); 16,412 (1910); 13,289 (1930)

Periods of population growth: pre-1850–1860; 1870–1900; 1970s; 1990–2010

Subdivisions: Three cities; four villages; 16 townships

National Register listings: Three

Pre-1940 residences (estimated): 1,129 (20%)
Pre-1940 housing survival rate: 27%
Pre-1860 housing survival rate (1940): 2.5%

Farm housing in disrepair (1950): 14.6%

Nonfarm housing in disrepair (1950): 8.1%

Average farmhouse value (1930): $932
Average outbuilding value (1930): $699
Average farmhouse size (1940): 4.5 rooms
Number of farms (1920): 2,649
Average farm size (1920): 91.7 acres
Sources of settlement: Illinois, Virginia, Ohio, Indiana, Kentucky, and Pennsylvania
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Osceola

Namesake: Osceola, Seminole leader

Founding: 1839 (platting); 1842 (post office); 1868 (incorporation)

Population (2020): 909

Population (historic): 314 (1860); 373 (1880); 1,037 (1900); 1,043 (1930)

Periods of population growth: pre-1860–1910; 1920–1940; 1990–2010
Pre-1940 residences (estimated): 216 (35.9%)
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