DeKalb County, Missouri

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

Namesake: Johann de Kalb, Continental Army general
Seat: Maysville (1845–)

Land area: 421 square miles

Population (2020): 11,029

Population (historic): 2,075 (1850); 9,858 (1870); 14,539 (1890); 12,531 (1910); 10,270 (1930)

Periods of population growth: pre-1850–1890; 1960–2010

Subdivisions: Four cities; two villages; nine townships

National Register listings: Three

Pre-1940 residences (estimated): 794 (18.3%)
Pre-1940 housing survival rate: 31.6%
Pre-1860 housing survival rate (1940): 2%

Farm housing in disrepair (1950): 4.4%

Nonfarm housing in disrepair (1950): 5.9%

Average farmhouse value (1930): $1,546
Average outbuilding value (1930): $1,220
Average farmhouse size (1940): 5.6 rooms
Number of farms (1920): 2,023
Average farm size (1920): 118.6 acres
Sources of settlement: Ohio, Illinois, Kentucky, Indiana, and Pennsylvania
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Maysville

Namesake: Maysville, Kentucky

Founding: 1845 (platting); 1846 (post office)

Population (2020): 1,095

Population (historic): 418 (1880); 925 (1900); 946 (1930)

Periods of population growth: pre-1880–1920; 1930s; 1960–1980; 1990s
Pre-1940 residences (estimated): 155 (26.3%)
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Outstanding Buildings

1. *Absolom Riggs House (c. 1865). Irwin Road, south of Crabill Road. Adams.
2. *John Thrush Farm (c. 1900). 8720 Lakesite Road. Colfax. Eastlake.
3. *William Burke House (1896–1897). Main Road, east of Lake Road. Grant. Eastlake. Razed.