Cheboygan is a city in the U.S. state of Michigan. It is the county seat and largest settlement of Cheboygan County. At the 2020 census, Cheboygan had a population 4,770. Cheboygan is situated on Lake Huron at the mouth of the Cheboygan River. It is the fourth-largest American city on Lake Huron after Bay City, Port Huron, and Alpena. Cheboygan is part of Northern Michigan, and is the northernmost city in Michigan's Lower Peninsula.