Marion County, Iowa

Marion County
Location within the U.S. state of Iowa
Iowa's location within the U.S.
Coordinates: 41°19′52″N 93°06′08″W / 41.331111111111°N 93.102222222222°W / 41.331111111111; -93.102222222222
Country United States
State Iowa
Founded1845
Named afterFrancis Marion
SeatKnoxville
Largest cityPella
Area
  Total
571 sq mi (1,480 km2)
  Land555 sq mi (1,440 km2)
  Water16 sq mi (40 km2)  2.8%
Population
 (2020)
  Total
33,414
  Estimate 
(2023)
33,770
  Density59/sq mi (23/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district1st
Websitewww.marioncountyiowa.gov

Marion County is a county in the U.S. state of Iowa. As of the 2020 census, the population was 33,414. The county seat is Knoxville. It is named for Francis Marion, a brigadier general from South Carolina in the American Revolutionary War.