Saint Clair County is in the state of Michigan’s southeast region. Saint Clair County has a land area of 721.17 square miles and a water area of 115.34 square miles. St. Clair County is ranked 13th in population of Michigan. St. Clair County has over 140 miles of pristine shoreline. St. Clair County, which has a wealth of water resources, has the world’s longest freshwater boardwalk along the St. Clair River, which marks the international boundary between Michigan and Ontario, Canada.
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