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.

Chisago County is a county in the east-central part of the U.S. state of Minnesota. The county covers an area of 442 square miles and, as of the 2020 Census, had a population of 56,621 people. It is part of the Minneapolis-St. Paul-Bloomington Metropolitan Statistical Area.