Le Mars is a city in and the county seat of Plymouth County, Iowa, United States. The population was 9,237 at the 2000 census. Le Mars is the home of Wells' Dairy, the world's largest producer of ice cream novelties in one location and is the self-proclaimed "Ice Cream Capital of the World". Wells is most well known for its Blue Bunny products. Le Mars, located on the Floyd River, is northeast of Sioux City. Le Mars is the former home of Westmar University, which closed in 1997.