UpAlphabetical listing of Places in Isabela
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Tacnalan | city | Isabela | Philippines | 17.10 | 122.46 | 55 | 2037 |
| Tagaran | city | Isabela | Philippines | 16.97 | 121.77 | 164 | 42814 |
| Tagbak | city | Isabela | Philippines | 17.25 | 122.42 | 3 | 240 |
| Talaca | city | Isabela | Philippines | 17.31 | 121.60 | 328 | 12965 |
| Talaytay | city | Isabela | Philippines | 17.11 | 122.44 | 3 | 1510 |
| Tallag | city | Isabela | Philippines | 17.43 | 121.72 | 173 | 24130 |
| Tallungan | city | Isabela | Philippines | 16.99 | 121.81 | 127 | 45656 |
| Tamsem | city | Isabela | Philippines | 17.39 | 121.81 | 150 | 18049 |
| Tamsen | city | Isabela | Philippines | 17.39 | 121.81 | 150 | 18049 |
| Tancul | city | Isabela | Philippines | 17.16 | 121.92 | 150 | 22820 |
| Tandul | city | Isabela | Philippines | 16.91 | 121.64 | 223 | 53833 |
| Tandul | city | Isabela | Philippines | 16.89 | 121.64 | 226 | 56535 |
| Tangal | city | Isabela | Philippines | 16.68 | 121.47 | 830 | 33815 |
| Tangcul | city | Isabela | Philippines | 17.16 | 121.92 | 150 | 22820 |
| Tangoul | city | Isabela | Philippines | 17.16 | 121.92 | 150 | 22820 |
| Tanze | city | Isabela | Philippines | 16.98 | 121.65 | 164 | 40844 |
| Tapay | city | Isabela | Philippines | 17.02 | 122.20 | 1148 | 3870 |
| Tapayo | city | Isabela | Philippines | 17.02 | 122.20 | 1148 | 3870 |
| Tappa | city | Isabela | Philippines | 16.77 | 122.02 | 830 | 6419 |
| Tappa | city | Isabela | Philippines | 16.72 | 122.07 | 1669 | 3491 |
| Tarigagay | city | Isabela | Philippines | 16.71 | 121.90 | 305 | 8786 |
| Taringsing | city | Isabela | Philippines | 16.67 | 121.47 | 321 | 31444 |
| Taringsing | city | Isabela | Philippines | 16.68 | 121.48 | 298 | 34458 |
| Taroc | city | Isabela | Philippines | 17.05 | 121.83 | 160 | 34522 |
| Teodoro Abad | city | Isabela | Philippines | 16.96 | 121.67 | 177 | 46285 |
| Tierra Virgen | city | Isabela | Philippines | 16.93 | 121.92 | 170 | 34750 |
| Tomines | city | Isabela | Philippines | 17.04 | 121.90 | 285 | 30259 |
| Trinidad | city | Isabela | Philippines | 17.22 | 121.65 | 255 | 14429 |
| Tuba | city | Isabela | Philippines | 17.03 | 121.79 | 157 | 38423 |
| Tubo | city | Isabela | Philippines | 17.03 | 121.79 | 157 | 38423 |
| Tubo | city | Isabela | Philippines | 17.15 | 121.88 | 206 | 22912 |
| Tuboc | city | Isabela | Philippines | 16.78 | 121.77 | 154 | 35580 |
| Tubog | city | Isabela | Philippines | 16.78 | 121.77 | 154 | 35580 |
| Tubuc | city | Isabela | Philippines | 16.78 | 121.77 | 154 | 35580 |
| Tubung | city | Isabela | Philippines | 17.29 | 121.81 | 150 | 22582 |
| Tuguegarao | city | Isabela | Philippines | 16.71 | 121.69 | 209 | 26840 |
| Tuhung | city | Isabela | Philippines | 17.29 | 121.81 | 150 | 22582 |
| Tuliao | city | Isabela | Philippines | 17.38 | 121.77 | 160 | 26881 |
| Tuliao | city | Isabela | Philippines | 17.38 | 121.78 | 160 | 24525 |
| Tumauini | city | Isabela | Philippines | 17.28 | 121.81 | 134 | 22452 |
| Tunggi | city | Isabela | Philippines | 17.36 | 121.77 | 154 | 28893 |
| Tunggui | city | Isabela | Philippines | 17.36 | 121.77 | 154 | 28893 |
| Tungi | city | Isabela | Philippines | 17.36 | 121.77 | 154 | 28893 |
| Tungui | city | Isabela | Philippines | 17.28 | 121.80 | 104 | 21730 |
| Tupa | city | Isabela | Philippines | 16.52 | 121.67 | 272 | 14060 |
| Tupa | city | Isabela | Philippines | 17.48 | 121.87 | 324 | 9313 |
| Tupac | city | Isabela | Philippines | 17.48 | 121.87 | 324 | 9313 |
| Tupas | city | Isabela | Philippines | 16.52 | 121.67 | 272 | 14060 |
| Tupax | city | Isabela | Philippines | 16.52 | 121.67 | 272 | 14060 |
| Turayong | city | Isabela | Philippines | 16.94 | 121.78 | 137 | 41132 |
| Turayung | city | Isabela | Philippines | 16.94 | 121.78 | 137 | 41132 |
| Turod | city | Isabela | Philippines | 17.25 | 121.56 | 278 | 12882 |
| Turod | city | Isabela | Philippines | 17.00 | 121.79 | 157 | 44321 |
| Turod Norte | city | Isabela | Philippines | 16.68 | 121.47 | 321 | 33815 |
| Turod Sur | city | Isabela | Philippines | 16.67 | 121.47 | 318 | 31444 |
| Turog | city | Isabela | Philippines | 16.61 | 121.67 | 259 | 14751 |
| Turud | city | Isabela | Philippines | 17.25 | 121.77 | 206 | 16926 |
| Tuyo | city | Isabela | Philippines | 17.13 | 121.92 | 187 | 22797 |
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