Anoka County is the fourth-most populous county in the U.S. state of Minnesota. As of the 2020 census, its population was 363,887. The county seat and namesake of the county is the city of Anoka, which is derived from the Dakota word anoka meaning "on both sides", referring to its location on both banks of the Rum River. The largest city in the county is Blaine, the tenth-largest city in Minnesota and the sixth-largest Twin Cities suburb.

Anoka is a city in and the county seat of Anoka County, Minnesota, United States. Its population was 17,142 at the 2010 census. Anoka is the "Halloween Capital of the World" because it hosted one of the first Halloween parades in 1920. It continues to celebrate the holiday each year with several parades. Anoka is a northern suburb of the Twin Cities. U.S. Highways 10 / 169 and State Highway 47 are three of Anoka's main routes, and it has a station on the Northstar Commuter Rail line to Minneapolis.