DeKalb County, Missouri

DeKalb County
DeKalb County Courthouse in Maysville
Location within the U.S. state of Missouri
Missouri's location within the U.S.
Coordinates: 39°54′N 94°24′W / 39.9°N 94.4°W / 39.9; -94.4
Country United States
State Missouri
FoundedFebruary 25, 1845
Named afterJohann de Kalb
SeatMaysville
Largest cityCameron
Area
  Total
426 sq mi (1,100 km2)
  Land421 sq mi (1,090 km2)
  Water4.5 sq mi (12 km2)  1.0%
Population
 (2020)
  Total
11,029
  Estimate 
(2023)
9,899
  Density26/sq mi (10.0/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district6th
Websitewww.dekalbcountymo.com

DeKalb County is a county located in the northwest portion of the U.S. state of Missouri. As of the 2020 census, the population was 11,029. Its county seat is Maysville. The county was organized February 25, 1845 and named for General Johann de Kalb, Baron de Kalb, of the Revolutionary War. 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.