what county is marco island fl
(Redirected from Marco Island). Marco Island is a city in Collier County, Florida, United States, located on an island by the same name in the Gulf of Mexico off the coast of Southwest Florida. It is a principal city of the Naples âMarco Island Metropolitan Statistical Area. The population was 16,413 at the 2010 census.Marco Island is the largest barrier island within Southwest Florida's Ten Thousand Islands area extending southerly to Cape Sable.arco Island is a city in Collier County, Florida, United States, located on an island by the same name in the Gulf of Mexico off the coast of Southwest Florida. It is a principal city of the Naples âMarco Island Metropolitan Statistical Area. The population was 16,413 at the 2010 census.