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. The county's largest city is North Branch. Within Chisago County is the Chisago Lakes area, which includes the combined areas of Shafer, Chisago City, Lindström, and Center City. Center City is the county seat.