11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jacksonville | 1 | 1,024,310 | 949,618 | 1.43% | 1,371 | 747 | City |
| Jacksonville | 2 | 1,024,310 | 951,925 | 1.43% | 1,371 | 747 | City |
| Fruit Cove | 3 | 36,826 | 33,038 | 1.37% | 2,285 | 16 | CDP |
| Jacksonville Beach | 4 | 23,584 | 23,830 | -0.19% | 3,223 | 7 | City |
| Jacksonville Beach | 5 | 23,584 | 23,814 | -0.19% | 3,223 | 7 | City |
| Atlantic Beach | 6 | 13,225 | 13,505 | -0.41% | 3,593 | 4 | City |
| Atlantic Beach | 7 | 13,225 | 13,493 | -0.41% | 3,593 | 4 | City |
| Neptune Beach | 8 | 6,990 | 7,210 | -0.6% | 2,991 | 2 | City |
| Neptune Beach | 9 | 6,990 | 7,197 | -0.6% | 2,991 | 2 | City |
| Baldwin | 10 | 1,382 | 1,398 | -0.22% | 684 | 2 | Town |
| Baldwin | 11 | 1,382 | 1,397 | -0.22% | 684 | 2 | Town |
Jacksonville is the largest city in Duval County, with a population of 1,024,310.
Baldwin is the smallest city in Duval County, with a population of 1,382.
There are 11 cities in Duval County, Florida.