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Flat Rock (also known as Macks Inn) was a former unincorporated community along Henrys Fork in Fremont County, Idaho, United States, [1] that is now part of the city of Island Park.[ citation needed ] The site of the former community in at 44°30′02″N111°20′11″W / 44.50056°N 111.33639°W . [1]
Island Park is part of the Rexburg Micropolitan Statistical Area.
A U.S. Highway passes through the community, as did a former U.S. Highway: