16 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Jacksonville | Duval County | 1,024,310 |
| Jupiter | Palm Beach County | 63,438 |
| Jasmine Estates | Pasco County | 25,293 |
| Jacksonville Beach | Duval County | 23,584 |
| Jupiter Farms | Martin County | 13,699 |
| Jensen Beach | Martin County | 12,800 |
| Jan Phyl Village | Polk County | 6,403 |
| June Park | Brevard County | 4,923 |
| Juno Beach | Palm Beach County | 3,998 |
| Jasper | Hamilton County | 3,597 |
| Juno Ridge | Palm Beach County | 1,377 |
| Jupiter Island | Martin County | 843 |
| Jennings | Hamilton County | 778 |
| Jay | Santa Rosa County | 596 |
| Jupiter Inlet Colony | Martin County | 468 |
| Jacob City | Jackson County | 233 |