16 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Jacksonville | Duval County | 1,038,787 |
| Jupiter | Palm Beach County | 63,889 |
| Jasmine Estates | Pasco County | 24,111 |
| Jacksonville Beach | Duval County | 23,538 |
| Jupiter Farms | Martin County | 13,717 |
| Jensen Beach | Martin County | 12,629 |
| Jan Phyl Village | Polk County | 5,850 |
| June Park | Brevard County | 5,027 |
| Juno Beach | Palm Beach County | 4,028 |
| Jasper | Hamilton County | 3,646 |
| Juno Ridge | Palm Beach County | 1,385 |
| Jupiter Island | Martin County | 849 |
| Jennings | Hamilton County | 784 |
| Jay | Santa Rosa County | 610 |
| Jupiter Inlet Colony | Martin County | 481 |
| Jacob City | Jackson County | 236 |