Geography Union is located northwest of the center of Burnett County, with its northwestern border following the St. Croix River, the state line between Wisconsin and Minnesota. The Clam River flows into the St. Croix in Union, entering the town from the south.
Geography Union is located northwest of the center of Burnett County with its northwestern border following the St Croix River the state line between Wisconsin and Minnesota The Clam River flows into the St Croix in Union entering the town from the south