Muskegon County is a county in the U.S. state of Michigan. As of 2020, the population was 175,824. The county seat is Muskegon.

Muskegon is a city in and the county seat of Muskegon County, Michigan, United States. Situated around a harbor of Lake Michigan, Muskegon is known for fishing, sailing regattas, and pleasure boating, and as a commercial- and cruise-ship port. It is a popular vacation destination because of its freshwater beaches, architecture, and public art collection. It is the most populous city along Lake Michigan's eastern shore. At the 2020 census, the city's population was 38,318. The city is administratively autonomous from adjacent Muskegon Township.