6 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jacksonville | 1 | 1,008,485 | 951,880 | 1.14% | 1,350 | 747.26 | City |
| Fruit Cove | 2 | 36,826 | 33,038 | 1.37% | 2,285 | 16.11 | CDP |
| Jacksonville Beach | 3 | 23,203 | 23,813 | -0.52% | 3,171 | 7.32 | City |
| Atlantic Beach | 4 | 12,972 | 13,496 | -0.8% | 3,524 | 3.68 | City |
| Neptune Beach | 5 | 6,840 | 7,199 | -1.04% | 2,927 | 2.34 | City |
| Baldwin | 6 | 1,346 | 1,396 | -0.74% | 666 | 2.02 | Town |
Jacksonville is the largest city in Duval County, with a population of 1,008,485.
Baldwin is the smallest city in Duval County.
There are 6 cities in Duval County, Florida.