Marsh Harbour is a town in Abaco Islands, Bahamas, with a population of 6,283 as of 2012. The settlement lies on a peninsula just off the Great Abaco Highway, which runs south through Great Abaco to Cherokee Point and Little Harbour. North of town, the road becomes S.C. Bootle Highway, another smooth stretch that runs north and west toward Treasure Cay and Little Abaco.