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.

North Branch is a city in Chisago County, Minnesota, United States, at the junction of Interstate 35 and Minnesota State Highway 95. The population was 10,787 at the 2020 census. It is named for the north branch of the Sunrise River, which flows through the city.