Fort Gratiot, MI

ZIP code 48059 serves the Lakeport area in northern St. Clair County, along Michigan’s Lake Huron shore. Its best-known landmark is Lakeport State Park, a public recreation area with a beach, campground, and lake access. The surrounding postal area includes residential neighborhoods and rural stretches, with local roads following the shoreline and connecting residents to nearby Port Huron and communities farther north.