Pentoga, MichiganPentoga is an unincorporated community in Iron County, in the U.S. state of Michigan.HistoryA post office was established at Pentoga in 1900, and remained in operation until it was discontinued in 1937. The community was given its name by the owners of a local mill. It stemmed from the name of a Native American chief's wife; her tribe had made their home along the shore of Chicagon Lake before selling it and moving to the Lac Vieux Desert Indian Reservation.