Petoskey is the largest city and the county seat of Emmet County, Michigan, and is the largest settlement within the county. Petoskey has a population of 5,877 at the 2020 census, up from 5,670 at the 2010 census. Petoskey is part of Northern Michigan, and is one of the northernmost cities in Michigan's Lower Peninsula. Petoskey is located on the southern shore of Little Traverse Bay, a bay of Lake Michigan. Petoskey sits directly across the bay from Harbor Springs, another Emmet County city.