Average GPS coordinates for Saint Clair Postcode location: 42.826, -82.513. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Saint Clair on map:

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Listing cities & postcodes (1):
>> Michigan, 48079 Saint Clair, St. Clair, GPS coordinates: 42.8255,-82.5133