| City | County | 2026 Pop. ↓ |
|---|---|---|
| Jacksonville | Duval County | 1,032,061 |
| Jupiter | Palm Beach County | 62,701 |
| Jasmine Estates | Pasco County | 24,111 |
| Jacksonville Beach | Duval County | 23,572 |
| 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 | 3,960 |
| Jasper | Hamilton County | 3,488 |
| Juno Ridge | Palm Beach County | 1,385 |
| Jupiter Island | Martin County | 847 |
| Jennings | Hamilton County | 770 |
| Jay | Santa Rosa County | 607 |
| Jupiter Inlet Colony | Martin County | 469 |
| Jacob City | Jackson County | 232 |