Isanti County is a county in the east-central part of the U.S. state of Minnesota. As of the 2020 census, the population was 41,135. Its county seat is Cambridge.

Cambridge is a city in Isanti County, Minnesota, United States, located at the junction of Minnesota State Highways 65 and 95. The population was 9,611 at the 2020 census. It is the county seat of Isanti County. It is located along the Rum River and BNSF's Hinckley Subdivision. Cambridge is notable for having the highest percentage of Swedish Americans of any city in the United States with a population of over 5,000 people.