Oregon County, Missouri

Founding: 1845 (declared in 1841)
Parent county: Ripley

Namesake: The Oregon Territory
Seat: Thomasville (1845–1859); Alton (1859–)

Land area: 790 square miles

Population (2020): 8,635

Population (historic): 1,432 (1850); 3,287 (1870); 10,467 (1890); 14,681 (1910); 12,220 (1930)

Periods of population growth: pre-1850–1910; 1930s; 1970s; 1990–2010

Subdivisions: Three cities; one CDP; 18 townships

National Register listings: Three

Pre-1940 residences (estimated): 946 (17.2%)
Pre-1940 housing survival rate: 23.3%
Pre-1860 housing survival rate (1940): 1.6%

Farm housing in disrepair (1950): 21.6%

Nonfarm housing in disrepair (1950): 14.4%

Average farmhouse value (1930): $537
Average outbuilding value (1930): $310
Average farmhouse size (1940): 3.8 rooms
Number of farms (1920): 2,031
Average farm size (1920): 70.5 acres
Sources of settlement: Arkansas, Tennessee, Illinois, and Kentucky
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Alton

Namesake: Alton, Illinois

Founding: 1859 (platting); 1860 (post office); 1929 (incorporation)

Population (2020): 707

Population (historic): 76 (1870); 439 (1930); 576 (1940)

Pre-1940 residences (estimated): 81 (21.8%)
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