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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. The city lies at the southern end of Lake Huron and is the easternmost point on land in Michigan.
In 1814, Fort Gratiot was established at the base of Lake Huron and was considered the first organized population in the area. In 1857, Port Huron became an incorporated city. Port Huron's population grew rapidly after the 1850s due in part to a successful shipbuilding and lumber trade. By 1870, Port Huron's population exceeded that of surrounding villages. In 1871, the Supreme Court designated Port Huron as the County Seat.
On Sunday, October 8 1871, the city, as well as White Rock and surrounding areas, burned in a devastating fire. A series of other fires leveled Holland and Manistee, Michigan, as well as Peshtigo, Wisconsin and Chicago on the same day.
The following historic sites have been recognized by the State of Michigan through its historic marker program.