Le Mars is a city and the county seat of Plymouth County, Iowa, United States. It is located on the Floyd River northeast of Sioux City. The population was 10,571 at the time of the 2020 census. Le Mars is located within America Township and is part of the Sioux City metropolitan area.
Midwest
Le Mars
Plymouth County, IA
Population
10,549
Walk Score
83 · Very Walkable
Median rent
$834
Median home value
$186,300
Founded
1869
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On the National Register
Historic districts
- Foster Park Historic District · listed 2008
- Le Mars Downtown Commercial Historic District · listed 2012
- Le Mars Municipal Park and Golf Course Historic District · listed 2001
Notable landmarks
- Le Mars Central High School · listed 1999
- Le Mars Public Library · listed 1979
- Plymouth County Courthouse · listed 1981
- St. George's Episcopal Church · listed 1976
- Tonsfeldt Round Barn · listed 1986
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