Circle Pines is a city in Anoka County, Minnesota, United States. The population was 5,025 at the 2020 census. According to the United St…Circle Pines is a city in Anoka County, Minnesota, United States. The population was 5,025 at the 2020 census. According to the United States Census Bureau, the city has a total area of 1.97 square miles, of which 1.78 square miles is land and 0.19 square miles is water.