| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Tabatab | city | Province of Ilocos Sur | Philippines | 17.1783333 | 120.7111111 | 1456 | 2306 |
| Tablac | city | Province of Ilocos Sur | Philippines | 17.2166667 | 120.4833333 | 328 | 40323 |
| Tacbo | city | Province of Ilocos Sur | Philippines | 16.95 | 120.65 | 4921 | 6219 |
| Taft | city | Province of Ilocos Sur | Philippines | 17.2388889 | 120.5322222 | 328 | 25542 |
| Tagpen | city | Province of Ilocos Sur | Philippines | 16.95 | 120.6 | 1161 | 6221 |
| Tagudin | city | Province of Ilocos Sur | Philippines | 16.9311111 | 120.4494444 | 167 | 30053 |
| Taguipuro | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.3833333 | 16 | 92225 |
| Taigon | city | Province of Ilocos Sur | Philippines | 17.2219444 | 120.6177778 | 1446 | 7610 |
| Takig | city | Province of Ilocos Sur | Philippines | 17.9666667 | 120.4833333 | 72 | 15895 |
| Taleb | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.45 | 98 | 78350 |
| Taleb | city | Province of Ilocos Sur | Philippines | 17.6 | 120.45 | 328 | 72043 |
| Taleb | city | Province of Ilocos Sur | Philippines | 17.45 | 120.5333333 | 164 | 45796 |
| Talebubu | city | Province of Ilocos Sur | Philippines | 16.95 | 120.7666667 | 2942 | 8215 |
| Taliao | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.5 | 55 | 25605 |
| Talipan | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.9666667 | 3608 | 1640 |
| Tallawen | city | Province of Ilocos Sur | Philippines | 16.9333333 | 120.45 | 167 | 30053 |
| Talogtog | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| Tamag | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.3833333 | 16 | 92225 |
| Tamcang | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.6166667 | 2424 | 5493 |
| Tamorong | city | Province of Ilocos Sur | Philippines | 17.6 | 120.35 | 16 | 51713 |
| Tamorong | city | Province of Ilocos Sur | Philippines | 17.6 | 120.3666667 | 16 | 51713 |
| Tamorong | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.4333333 | 82 | 24405 |
| Tamorong | city | Province of Ilocos Sur | Philippines | 16.8255556 | 120.5969444 | 3077 | 3675 |
| Tamoroog | city | Province of Ilocos Sur | Philippines | 16.8255556 | 120.5969444 | 3077 | 3675 |
| Tampogo | city | Province of Ilocos Sur | Philippines | 16.9833333 | 120.45 | 118 | 19553 |
| Tampogo | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.45 | 62 | 25396 |
| Tampugo | city | Province of Ilocos Sur | Philippines | 16.9833333 | 120.45 | 118 | 19553 |
| Tampugo | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.45 | 62 | 25396 |
| Tamurong | city | Province of Ilocos Sur | Philippines | 17.5308333 | 120.4091667 | 16 | 68022 |
| Tamurong | city | Province of Ilocos Sur | Philippines | 17.2166667 | 120.4166667 | 65 | 36480 |
| Tamurong | city | Province of Ilocos Sur | Philippines | 17.2166667 | 120.4166667 | 65 | 36480 |
| Tamurong Primero | city | Province of Ilocos Sur | Philippines | 17.2166667 | 120.4166667 | 65 | 36480 |
| Tamurong Segundo | city | Province of Ilocos Sur | Philippines | 17.2166667 | 120.4166667 | 65 | 36480 |
| Tandiam | city | Province of Ilocos Sur | Philippines | 17.75 | 120.4333333 | 26 | 48847 |
| Tangadan | city | Province of Ilocos Sur | Philippines | 17.1666667 | 120.45 | 78 | 40620 |
| Tangadan | city | Province of Ilocos Sur | Philippines | 17.5069444 | 120.5147222 | 544 | 20177 |
| Tangadan | city | Province of Ilocos Sur | Philippines | 17.0758333 | 120.6097222 | 2703 | 5493 |
| Tangado | city | Province of Ilocos Sur | Philippines | 17.5069444 | 120.5147222 | 544 | 20177 |
| Tangadon | city | Province of Ilocos Sur | Philippines | 17.5069444 | 120.5147222 | 544 | 20177 |
| Tangaoan | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.4666667 | 150 | 32306 |
| Tangaoan | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.4833333 | 226 | 32306 |
| Tangaoan | city | Province of Ilocos Sur | Philippines | 17.3666667 | 120.4833333 | 29 | 40757 |
| Tangaoan | city | Province of Ilocos Sur | Philippines | 17.1619444 | 120.6127778 | 1476 | 7653 |
| Tangawan | city | Province of Ilocos Sur | Philippines | 17.1619444 | 120.6127778 | 1476 | 7653 |
| Tanggaoan | city | Province of Ilocos Sur | Philippines | 17.1619444 | 120.6127778 | 1476 | 7653 |
| Tapao | city | Province of Ilocos Sur | Philippines | 17.9 | 120.4666667 | 114 | 34543 |
| Taramuting | city | Province of Ilocos Sur | Philippines | 17.5333333 | 120.45 | 328 | 58129 |
| Tarangotong | city | Province of Ilocos Sur | Philippines | 16.9333333 | 120.45 | 167 | 30053 |
| Tayac | city | Province of Ilocos Sur | Philippines | 17.6166667 | 120.45 | 72 | 72043 |
| Tiagan | city | Province of Ilocos Sur | Philippines | 17.2219444 | 120.6177778 | 1446 | 7610 |
| Tibo | city | Province of Ilocos Sur | Philippines | 16.9094444 | 120.5913889 | 1968 | 5696 |
| Tibunec | city | Province of Ilocos Sur | Philippines | 16.8833333 | 120.5333333 | 551 | 24676 |
| Tinaan | city | Province of Ilocos Sur | Philippines | 17.3833333 | 120.4833333 | 45 | 47927 |
| Tobo | city | Province of Ilocos Sur | Philippines | 16.9205556 | 120.5875 | 3166 | 6221 |
| Torod | city | Province of Ilocos Sur | Philippines | 17.0666667 | 120.4666667 | 91 | 38465 |
| Tubalina | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.6333333 | 1896 | 5011 |
| Tubigay | city | Province of Ilocos Sur | Philippines | 17.8333333 | 120.5 | 328 | 24653 |
| Tubiliba | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.6333333 | 1896 | 5011 |
| Tubutub | city | Province of Ilocos Sur | Philippines | 16.8333333 | 120.5333333 | 583 | 17299 |
| Tupac | city | Province of Ilocos Sur | Philippines | 17.4666667 | 120.5166667 | 328 | 30562 |
| Tupac-Estancia | city | Province of Ilocos Sur | Philippines | 17.4666667 | 120.5166667 | 328 | 30562 |
| Turod | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.3833333 | 16 | 92225 |
| Turod | city | Province of Ilocos Sur | Philippines | 17.8 | 120.4333333 | 26 | 37587 |
| Turod | city | Province of Ilocos Sur | Philippines | 17.0666667 | 120.4666667 | 91 | 38465 |
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