in what county is port huron, michigan
Sponsored Topics. Port Huron is a city in the U.S. state of Michigan and the county seat of St. Clair County. The population was 32,338 at the 2000 census. The city is adjacent to Port Huron Township but is administratively autonomous. It is joined by the Blue Water Bridge over the St. Clair River to Sarnia, Ontario in Canada.