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Hutchinson Island South is a census-designated place (CDP) on the barrier island of Hutchinson Island in St. Lucie County, Florida, United States. As of the 2020 census, Hutchinson Island South had a population of 4,988. It is part of the Port St. Lucie Metropolitan Statistical Area. Its mail is delivered from Jensen Beach 34957 in nearby Martin County. The Jensen Beach post office has a postal contract substation known as Hutchinson Beach located at 11007 South Ocean Drive, but it offers only post office boxes and counter services.