Rice Lake is a city in Saint Louis County, Minnesota, United States. The population was 4,112 at the 2020 census. Main routes include Rice L…Rice Lake is a city in Saint Louis County, Minnesota, United States. The population was 4,112 at the 2020 census. Main routes include Rice Lake Road and Martin Road. Rice Lake Road runs north–south, and Martin Road runs east–west. Other routes include Howard Gnesen Road, Arnold Road, Calvary Road, West Tischer Road, and West Beyer Road.