Satellite map of St. Clair County, Michigan
St. Clair County is a county located in the U.S. state of Michigan bordering the St. Clair River. As of the 2010 census, the population was 163,040. It is the 13th-most populous county in the state, and the county seat is Port Huron, located at the north end of the St. Clair River at Lake Huron.
Latitude: 42° 55' 48.00" N
Longitude: -82° 40' 12.00" W