Michigan City is an unincorporated community in Benton County, Mississippi, United States. It is located along Mississippi Highway 7 in north central Benton County, just south of the Tennessee state line, approximately three miles north of U. S. Route 72. Although it is unincorporated, Michigan City has a post office, with the ZIP code of 38647.. The nearly abandoned Mississippi Central Railroad runs through Michigan City, and is only used rarely for freight trafficking. Michigan City is neighbored by Grand Junction, Tennessee to the north, Lamar, Mississippi to the south, Hopwell, Mississippi to the east, and Early Grove to the west.