<P> Johns Island, also spelled John's Island, is an island in Charleston County, South Carolina, United States, and is the largest island in the state of South Carolina . Johns Island is bordered by the Wadmalaw, Seabrook, Kiawah, Edisto, Folly, and James islands; the Stono and Kiawah rivers separate Johns Island from its border islands . It is the fourth - largest island on the US east coast, surpassed only by Long Island, Mount Desert Island and Martha's Vineyard . Johns Island is 84 square miles (220 km) in area, with a population of 21,500 people . </P> <P> Johns Island was named after Saint John Parish in Barbados by the first English colonial settlers on the island, who had come from there . </P>

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