Saint Clair, MI is a city located in Saint Clair County, Michigan and has a land area of 41.85 square miles (108.39 km2). The water area for the city is 1.44 square miles or 3.73 km2. There is one unique zip code in Saint Clair, Michigan and it is 48079. The area code(s) for Saint Clair is 810.
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