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DeKalb County is a county located in the northwest portion of the state of Missouri. Based on the 2010 census, the population was 12,892.
Its county seat is Maysville. The county was organized February 25, 1845 and named for General Johann de Kalb, Baron de Kalb, of the
DeKalb County is part of the St. Joseph, MO-KS Metropolitan Statistical Area, which is also included in the Kansas City-Overland Park-Kansas City, MO-KS Combined Statistical Area.
Named for Johann Kalb, Baron deKalb. Baron deKalb was a German-born officer who served with the French Army and was killed in the American Revolution.
County QuickFacts: CensusBureau Quick Facts
When Missouri was admitted to the union, the present counties north of the Missouri River were included in Ray County. In 1822 Clay County was organized, and included the present county of De Kalb. In 1833 the county was again annexed to Clinton for civil and military purposes, and it was not until 1845 that De Kalb was made a separate and distinct county. It was named in honor of Baron John De Kalb, "a Frenchman of Revolutionary fame, who was killed in the battle of Camden in 1780." (Eaton, p. 284; HIST. HARRISON, p. 119; SESSION LAWS, 1844-5, p. 40; ATLAS DE KALB, 1877)
Source: Ewing, Martha K. "Place Names In The Northwest Counties Of Missouri." M.A. thesis., University of Missouri-Columbia, 1929.
As reported by the Census Bureau, the county has a total area of 426 square miles (1,100 km2), of which 421 square miles (1,090 km2) is
land and 4.5 square miles (12 km2) (1.0%) is water
Bordering counties are as follows:
Maysville R-I School District - Maysville
Osborn R-0 School District - Osborn
Stewartsville C-2 School District - Stewartsville
Union Star R-II School District - Union Star