Port Huron is a city located in the state of Michigan, United States. It serves as the county seat of St. Clair County and has a population of 28,983 according to the 2020 census.
The city is bordered on its western side by Port Huron Township, though the two entities are administered autonomously. As the largest city in Michigan's Thumb area, it is considered the principal community of the Blue Water Area, which has been rebranded as Michigan's Thumb Coast for tourism purposes.