| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Tablonal | city | Puerto Rico | United States | 18.39806 | -67.16722 | 16 | 42159 |
| Tablones | city | Puerto Rico | United States | 18.24306 | -65.74556 | 354 | 30203 |
| Tabonuco | city | Puerto Rico | United States | 18.28528 | -66.88833 | 1299 | 26313 |
| Tallaboa | city | Puerto Rico | United States | 17.99694 | -66.71667 | 331 | 18251 |
| Tallaboa Alta | city | Puerto Rico | United States | 18.05306 | -66.70056 | 639 | 58179 |
| Tallaboa Poniente | city | Puerto Rico | United States | 18.03389 | -66.73444 | 328 | 32488 |
| Tamarindo | city | Puerto Rico | United States | 18.4375 | -67.15556 | 301 | 58726 |
| Tiburones | city | Puerto Rico | United States | 18.43361 | -66.58111 | 321 | 46048 |
| Tiburones | city | Puerto Rico | United States | 17.98583 | -66.54139 | 3 | 29715 |
| Tierras Nuevas Poniente | city | Puerto Rico | United States | 18.46389 | -66.48889 | 82 | 26410 |
| Tintillo | city | Puerto Rico | United States | 18.40694 | -66.12944 | 114 | 269509 |
| Tio | city | Puerto Rico | United States | 18.37222 | -66.17556 | 78 | 216045 |
| Toa Alta | city | Puerto Rico | United States | 18.39028 | -66.24861 | 88 | 165424 |
| Toa Baja | city | Puerto Rico | United States | 18.44583 | -66.26 | 13 | 95506 |
| Toita | city | Puerto Rico | United States | 18.1325 | -66.19028 | 1384 | 56136 |
| Toma de Agua | city | Puerto Rico | United States | 18.355 | -65.90083 | 288 | 109639 |
| Tomas de Castro | city | Puerto Rico | United States | 18.18972 | -66.02667 | 853 | 90105 |
| Torrecillas | city | Puerto Rico | United States | 18.34083 | -66.435 | 498 | 43993 |
| Torres | city | Puerto Rico | United States | 18.14639 | -66.27611 | 1952 | 43973 |
| Torrimar | city | Puerto Rico | United States | 18.38972 | -66.11778 | 150 | 333328 |
| Tosquero | city | Puerto Rico | United States | 18.39 | -67.20389 | 39 | 42159 |
| Town Park | city | Puerto Rico | United States | 18.39194 | -66.03028 | 216 | 320351 |
| Tras Talleres | city | Puerto Rico | United States | 18.44778 | -66.07972 | 32 | 264480 |
| Tres Hermanos | city | Puerto Rico | United States | 18.28639 | -67.19028 | 6 | 28576 |
| Trujillo Alto | city | Puerto Rico | United States | 18.35667 | -66.00778 | 167 | 299031 |
| Trujillo Bajo | city | Puerto Rico | United States | 18.37 | -65.95583 | 242 | 163904 |
| Truman | city | Puerto Rico | United States | 18.41944 | -66.04 | 26 | 235925 |
| Tuque | city | Puerto Rico | United States | 17.98889 | -66.65722 | 29 | 44459 |
| Turabo | city | Puerto Rico | United States | 18.21917 | -66.06306 | 334 | 108104 |
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