Marco Island is a city and island in Collier County, Florida, United States. The population was 14,879 at the 2000 census. As of 2004, the population recorded by the U.S. Census Bureau is 15,828. The town was incorporated in 1998. Marco Island apartments for rent comparison page shows most up to date rent information on Marco Island apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.