Collier County is a county located in the U.S. state of Florida. Its county seat is Naples.
Collier County is coextensive with the Naples-Marco Island, Florida Metropolitan Statistical Area, a metropolitan statistical area (MSA) designated by the Office of Management and Budget and used for statistical purposes by the Census Bureau and other agencies. Naples and Marco Island are designated as the MSA's principal cities. The Naples, Florida Metropolitan Statistical Area was first defined in 1990. Marco Island was added as a principal city and the name changed to its present form in 2003.
