Sullivan County, Missouri

Sullivan County
Sullivan County Courthouse in Milan
Location within the U.S. state of Missouri
Missouri's location within the U.S.
Coordinates: 40°13′N 93°07′W / 40.21°N 93.11°W / 40.21; -93.11
Country United States
State Missouri
Founded1843 (created)
1845 (organized)
Named afterJohn Sullivan
SeatMilan
Largest cityMilan
Area
  Total
652 sq mi (1,690 km2)
  Land648 sq mi (1,680 km2)
  Water3.5 sq mi (9 km2)  0.5%
Population
 (2020)
  Total
5,999
  Density9.2/sq mi (3.6/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district6th

Sullivan County is a county located in the northern portion of the U.S. state of Missouri. As of the 2020 census, the population was 5,999. Its county seat is Milan. The county was organized February 14, 1845, and named for Major General John Sullivan of the American Revolutionary War.