Lewis County, Missouri

Founding: 1833
Parent county: Unorganized territory

Namesake: Meriwether Lewis, American explorer
Seat: Monticello (1834–)

Land area: 505 square miles

Population (2020): 10,032

Population (historic): 6,040 (1840); 12,286 (1860); 15,925 (1880); 16,724 (1900); 12,093 (1930)

Periods of population growth: pre-1840–1900; 1950–1970; 1990s

Subdivisions: Five cities; one village; eight townships

National Register listings: 12

Pre-1940 residences (estimated): 852 (18.8%)
Pre-1940 housing survival rate: 37.1%
Pre-1860 housing survival rate (1940): 11.8%

Farm housing in disrepair (1950): 16.4%

Nonfarm housing in disrepair (1950): 11.7%

Average farmhouse value (1930): $1,284
Average outbuilding value (1930): $1,063

Average farmhouse size (1940): 5.3 rooms
Number of farms (1920): 1,878
Average farm size (1920): 129.5 acres
Sources of settlement: Kentucky, Illinois, Ohio, Virginia, and Germany

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Monticello

Namesake: Monticello, Thomas Jefferson's plantation

Founding: 1834 (platting); 1834 (post office)

Population (2020): 104

Population (historic): 301 (1870); 350 (1890); 283 (1910); 202 (1930)

Periods of population growth: pre-1870–1890; 1950s; 1990s; 2010s
Pre-1940 residences (estimated): 18 (28.6%)

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Outstanding Buildings

1. Frederick Graff House (c. 1860). 1409 McRoberts Road. Canton. Italianate.
2. Edward Cason House (c. 1850). 26621 Road CC. Highland.
3. Allen Tate House (c. 1865). 26058 Road Z. Union. Italianate.