Wikipedia says that Port Sanilac is a village in Sanilac Township of Sanilac County, pop 658:
This village was originally a lumberjack settlement on the shore of Lake Huron named “Bark Shanty Point.” In the late 1840s and 1850s, the settlement gained its first sawmill, schoolhouse, and general store. In 1854, Bark Shanty Point’s first post office opened. In 1857 the village was renamed to Port Sanilac, as it is in Sanilac Township in Sanilac County. Local legend attributes the name to a Wyandotte Indian Chief named Sanilac.