Clark County, Missouri

Founding: 1836
Parent county: Unorganized territory

Namesake: William Clark, American explorer
Seat: Waterloo (1837–1847, 1855–1872); Alexandria (1847–1855); Kahoka (1872–)

Land area: 505 square miles

Population (2020): 6,634

Population (historic): 2,846 (1840); 11,684 (1860); 15,031 (1880); 15,383 (1900); 10,254 (1930)

Periods of population growth: pre-1840–1900; 1970s

Subdivisions: Four cities; two villages; one CDP; 13 townships

Pre-1940 residences (estimated): 699 (20%)
Pre-1940 housing survival rate: 29.5%
Pre-1860 housing survival rate (1940): 6.2%

Farm housing in disrepair (1950): 12.4%

Nonfarm housing in disrepair (1950): 11.9%

Average farmhouse value (1930): $1,172
Average outbuilding value (1930): $881

Average farmhouse size (1940): 5.5 rooms
Number of farms (1920): 1,908
Average farm size (1920): 113.5 acres
Sources of settlement: Ohio, Iowa, Illinois, Kentucky, Indiana, and Pennsylvania

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Kahoka

Namesake: The Cahokia people

Founding: 1858 (platting as Cahoka); 1858 (post office); 1869 (incorporation)

Population (2020): 1,961

Population (historic): 704 (1880); 1,818 (1900); 1,507 (1930)

Periods of population growth: pre-1880–1900; 1930–1970; 1980–2000
Pre-1940 residences (estimated): 181 (18%)

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