Naples is a city in Collier County, Florida, United States. As of the 2020 census, the population was 19,115. Naples is a principal city of the Naples–Marco Island metropolitan area, which had a population of about 375,752 as of 2020. Naples' USPS City population includes most of the communities in Collier County with the notable exceptions of Immokalee, Marco Island, Ave Maria, Everglades City and a few others, and thus Naples' USPS City population is approximately 333,083.