Naples is a city in Collier County, Florida, United States. As of the 2020 census, the population was 19,115, down from 19,539 at the 2010 ce…Naples is a city in Collier County, Florida, United States. As of the 2020 census, the population was 19,115, down from 19,539 at the 2010 census. Naples is a principal city of the Naples–Marco Island metropolitan area, which had a population of about 375,752 as of 2020.
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