- Beltrami County, Minnesota has 2,504.6 square miles of land area and is the 4th largest county in Minnesota by total area. Beltrami County, Minnesota is bordered by Roseau County, Minnesota, Cass County, Minnesota, Clearwater County, Minnesota, Hubbard County, Minnesota, Marshall County, Minnesota, Itasca County, Minnesota, Lake of the Woods County, Minnesota, Koochiching County, Minnesota, and Pennington County, Minnesota.
