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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Outstanding Buildings

1. John Vickers House (c. 1855). Old US Highway 61, north of Road H. Clay.
2. Charles Henshaw House (c. 1869). 31920 Road 409. Clay.
3. Connable House (c. 1875). 32304 Road 409. Clay. Italianate.
4. Mitchell–McCoy House (1836/1860s). 28678 US Highway 61. Clay.
5. James Henning House (1857). Road 188, east of St. Francisville. Des Moines. Greek Revival. Razed.
6. Christopher Wolf House (c. 1855). 21476 Road B. Des Moines. Razed.
7. Johann Uhlmeyer House (1861). 10249 State Route 81. Jackson. Razed.
8. Robert McDermott Farm (c. 1895). Road 165, south of US Highway 136. Madison. Queen Anne. Razed.
9. John Rutherford House (1901). 22060 Road 174. Madison. Classical Revival.
10. Henry Blattner House (1864). Road A, north of Road 127. Wyaconda. Italianate. Razed.

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