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St. Marys is a city in Camden County, Georgia, United States, located on the southern border of Camden County on the St. Marys River. It had a population of 18,256 at the 2020 census, up from 17,121 at the 2010 census. It is part of the Kingsland, Georgia Micropolitan Statistical Area. The Florida border is just to the south across the river, Cumberland Island National Seashore is to the northeast, and Kingsland, Georgia, is to the west. Jacksonville, Florida, is 38 miles south, and Savannah, Georgia, is 110 miles north.