Anoka is a city in and the county seat of Anoka County, Minnesota, United States. The population was 17,921 at the 2020 census. Anoka is a northern suburb of the Twin Cities, at the confluence of the Rum and Mississippi Rivers. It is nicknamed the "Halloween Capital of the World" because in 1920 it hosted one of the first Halloween parades. It continues to celebrate the holiday each year with several parades. U.S. Highways 10 / 169 and State Highway 47 are three of Anoka's main routes, and it had a station on the Northstar Line to Minneapolis.