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Rest Haven is an unincorporated community and census-designated place (CDP) in Will County, Illinois, United States. As of the 2020 census, Rest Haven had a population of 502. It is in the southern part of the county, on the northeast side of the Kankakee River, 3.5 miles (5.6 km) south of Wilmington. It is bordered to the east by Ritchie and to the south, across the Kankakee, by Custer Park.