Plymouth County, Iowa

Plymouth County
Location within the U.S. state of Iowa
Iowa's location within the U.S.
Coordinates: 42°44′18″N 96°13′13″W / 42.738333333333°N 96.220277777778°W / 42.738333333333; -96.220277777778
Country United States
State Iowa
FoundedJanuary 15, 1851
Named afterPlymouth, Massachusetts
SeatLe Mars
Largest cityLe Mars
Area
  Total
864 sq mi (2,240 km2)
  Land863 sq mi (2,240 km2)
  Water0.8 sq mi (2 km2)  0.1%
Population
 (2020)
  Total
25,698
  Density30/sq mi (11/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district4th
Websiteplymouthcountyiowa.gov

Plymouth County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 25,698. The county seat is Le Mars. Plymouth County was named after Plymouth, Massachusetts.

Plymouth County is part of the Sioux City, IA-NE-SD Metropolitan Statistical Area.