Fair Plain is an unincorporated community in Berrien County in the U.S. state of Michigan. It is a Census-designated place used for statistical purposes. The population was 7,828 at the 2000 census. Fair Plain consists of the portion of St. Joseph Charter Township lying north of the St. Joseph River and a portion of Benton Charter Township. Fair Plain's boundaries are the City of Benton Harbor to the north, the St. Joseph River to the west and South, and M-139 to the east. Local spelling of the name is often 'Fairplain'. Fair Plain apartments for rent comparison page shows most up to date rent information on Fair Plain apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.