Onekama, MI is a city located in Manistee County, Michigan and has a land area of 10.22 square miles (26.47 km2). The water area for the city is 5.02 square miles or 13.00 km2. There is one unique zip code in Onekama, Michigan and it is 49675. The area code(s) for Onekama is 231.
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