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v t e Municipalities and communities of St. Clair County, Michigan , United States
County seat : Port Huron
Cities	Algonac Marine City Marysville Memphis ‡ Port Huron Richmond ‡ St. Clair Yale	Map_of_Michigan_highlighting_St._Clair_County.svg
Villages	Capac Emmett
Charter townships	China East China Fort Gratiot Port Huron
Civil townships	Berlin Brockway Burtchville Casco Clay Clyde Columbus Cottrellville Emmett Grant Greenwood Ira Kenockee Kimball Lynn Mussey Riley St. Clair Wales
CDPs	Lakeport Pearl Beach Ruby
Other unincorporated communities	Abbottsford Adair Allenton Anchorville Atkins Avoca Avalon Beach Bedore Belle River Berville Blaine Broadbridge Station Brockway Casco Cherry Beach Clays Landing Columbus Copeland Corner Fair Haven Fargo Forster Gardendale Grande Pointe Goodells Hawthorne Jeddo Kimball Keewahdin Lambs Lesterville Maple Leaf Martindale Beach Miller Muirs Muttonville North Lakeport North Street Perch Point Peters Pointe aux Tremble Rattle Run Riley Center Roberts Landing Sans Souci Smiths Creek Snyderville South Park Sparlingville Starville Tappan Thornton Wadhams Wales West Tappan
Footnotes	‡This populated place also has portions in an adjacent county or counties