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is a city in and the county seat of Kandiyohi County, Minnesota, United States. The population was 18,351 at the 2000 census.
U.S. Routes 12 and 71; and Minnesota State Highways 23 and 40 are four of the main routes in the city.
According to the United States Census Bureau, the city has a total area of 13.6 square miles (35.2 km²), of which, 11.8 square miles (30.7 km²) of it is land and 1.8 square miles (4.6 km²) of it is water. The total area is 12.94% water.
The 45º latitude line passes just south of Willmar, placing it just halfway between the equator and the North Pole.