Sullivan County, Missouri

Founding: 1845 (declared in 1843)
Parent county: Unorganized territory

Namesake: John Sullivan, Continental Army general
Seat: Milan (1845–)

Land area: 648 square miles

Population (2020): 5,999

Population (historic): 2,983 (1850); 11,907 (1870); 19,000 (1890); 18,598 (1910); 15,212 (1930)

Periods of population growth: pre-1850–1900; 1990s

Subdivisions: Six cities; three villages; one CDP; 12 townships

National Register listings: Six

Pre-1940 residences (estimated): 936 (27.9%)
Pre-1940 housing survival rate: 31.9%
Pre-1860 housing survival rate (1940): 2.8%

Farm housing in disrepair (1950): 12.6%

Nonfarm housing in disrepair (1950): 17.4%

Average farmhouse value (1930): $1,060
Average outbuilding value (1930): $728
Average farmhouse size (1940): 5.3 rooms
Number of farms (1920): 2,660
Average farm size (1920): 128 acres
Sources of settlement: Ohio, Indiana, Illinois, Kentucky, Iowa, and Virginia
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Milan

Namesake: Milan, Italy

Founding: 1845 (platting); 1847 (post office); 1859 (incorporation)

Population (2020): 1,819

Population (historic): 319 (1870); 1,234 (1890); 2,191 (1910); 2,002 (1930)

Periods of population growth: pre-1870–1920; 1930s; 1960–1980; 1990–2010
Pre-1940 residences (estimated): 293 (27.3%)
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