Quick Tour of Mackinac Island Mackinac Island (/ˈmækɪnɔː/ MAK-in-aw) is an island and resort area, covering 4.35 square miles in land area, in the U.S. state of Michigan. It is located in Lake Huron, at the eastern end of the Straits of Mackinac, between the state’s Upper and Lower Peninsulas.Read More …