3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Naples | 1 | 20,425 | 19,137 | 1.27% | 1,660 | 12 | City |
| Marco Island | 2 | 16,751 | 15,764 | 1.19% | 1,378 | 12 | City |
| Everglades | 3 | 405 | 358 | 2.27% | 443 | 1 | City |
Naples is the largest city in Collier County, with a population of 20,425.
Everglades is the smallest city in Collier County, with a population of 405.
There are 3 cities in Collier County, Florida.