Champlin is a city in Hennepin County, Minnesota, United States. The population was 23,919 at the 2020 census. Champlin is a northern su…Champlin is a city in Hennepin County, Minnesota, United States. The population was 23,919 at the 2020 census. Champlin is a northern suburb of Minneapolis. U.S. Highway 169 and Hennepin County Road 12 are two of the main routes in Champlin.