Marco Island is a city and barrier island in Collier County, Florida, 20 miles south of Naples on the Gulf Coast of the United States. It is the large…Marco Island is a city and barrier island in Collier County, Florida, 20 miles south of Naples on the Gulf Coast of the United States. It is the largest barrier island in Southwest Florida's Ten Thousand Islands area, which extends southerly to Cape Sable. Marco Island is home to an affluent beach community with resort amenities.
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