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″N 111°20′11″W / 44.50056°N 111.33639°W / 44.50056; -111.33639.
[1] Island Park is part of the Rexburg Micropolitan Statistical Area.
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