| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Thaiyur | city | Tamil Nadu | India | 12.77 | 80.19 | 22 | 55672 |
| Thakkolam | city | Tamil Nadu | India | 13.02 | 79.73 | 249 | 42701 |
| Thalanayar | city | Tamil Nadu | India | 10.56 | 79.77 | 3 | 31117 |
| Thaliyaripalaiyam | city | Tamil Nadu | India | 13.47 | 80.12 | 29 | 40268 |
| Thaliyarpālaiyam | city | Tamil Nadu | India | 13.37 | 80.16 | 32 | 41654 |
| Thambureddipalaiyam | city | Tamil Nadu | India | 13.34 | 80.00 | 98 | 41770 |
| Thambureddipalaiyam | city | Tamil Nadu | India | 13.44 | 80.14 | 49 | 43658 |
| Thanipadi | city | Tamil Nadu | India | 12.11 | 78.83 | 830 | 33227 |
| Thanjavur | city | Tamil Nadu | India | 10.79 | 79.14 | 6 | 128633 |
| Thanjavur - தஞ்சாவூர் | city | Tamil Nadu | India | 10.79 | 79.14 | 6 | 128633 |
| Tharangambadi | city | Tamil Nadu | India | 11.03 | 79.85 | 3 | 43129 |
| Thathankuppam | city | Tamil Nadu | India | 13.11 | 80.20 | 49 | 1517668 |
| Thattan Kolam | city | Tamil Nadu | India | 13.09 | 80.27 | 65 | 2096067 |
| Thattankulam | city | Tamil Nadu | India | 13.09 | 80.27 | 65 | 2096067 |
| Theagaraya Nagar | city | Tamil Nadu | India | 13.04 | 80.24 | 45 | 2765140 |
| Thekadi | city | Tamil Nadu | India | 9.60 | 77.17 | 3349 | 23705 |
| Thekkadi | city | Tamil Nadu | India | 9.60 | 77.17 | 3349 | 23705 |
| Thekkady | city | Tamil Nadu | India | 9.60 | 77.17 | 3349 | 23705 |
| Thenkasi | city | Tamil Nadu | India | 8.95 | 77.31 | 830 | 103594 |
| Thenpudupattu | city | Tamil Nadu | India | 13.28 | 80.26 | 32 | 57748 |
| Therumanur | city | Tamil Nadu | India | 10.93 | 79.10 | 124 | 34747 |
| Thevaram | city | Tamil Nadu | India | 9.90 | 77.28 | 1669 | 25002 |
| Thimiri | city | Tamil Nadu | India | 12.83 | 79.31 | 830 | 35555 |
| Thiru-Vi-Ka Nagar | city | Tamil Nadu | India | 13.10 | 80.25 | 42 | 2625003 |
| Thiru-Vi-Ka Nagar | city | Tamil Nadu | India | 13.12 | 80.24 | 45 | 1908390 |
| Thiru-alli-keni | city | Tamil Nadu | India | 13.05 | 80.28 | 45 | 1772718 |
| Thirukattupalli | city | Tamil Nadu | India | 10.85 | 78.95 | 167 | 51034 |
| Thirukkannapuram | city | Tamil Nadu | India | 10.87 | 79.70 | 13 | 85920 |
| Thirukodimaadachenkundrur | city | Tamil Nadu | India | 11.38 | 77.90 | 830 | 101322 |
| Thirumalavasal | city | Tamil Nadu | India | 11.24 | 79.84 | 0 | 54084 |
| Thirumangalam | city | Tamil Nadu | India | 13.09 | 80.21 | 39 | 1971412 |
| Thiruninravur | city | Tamil Nadu | India | 13.11 | 80.03 | 101 | 87724 |
| Thiruparangundram | city | Tamil Nadu | India | 9.88 | 78.07 | 830 | 65061 |
| Thirupparankundram | city | Tamil Nadu | India | 9.88 | 78.07 | 830 | 65061 |
| Thiruthani | city | Tamil Nadu | India | 13.18 | 79.62 | 275 | 56477 |
| Thiruthuraipoondi | city | Tamil Nadu | India | 10.53 | 79.64 | 16 | 48197 |
| Thiruvaiyaru | city | Tamil Nadu | India | 10.88 | 79.10 | 121 | 54576 |
| Thiruvalanchuli | city | Tamil Nadu | India | 10.93 | 79.33 | 82 | 115708 |
| Thiruvallarai | city | Tamil Nadu | India | 10.96 | 78.67 | 334 | 51994 |
| Thiruvallur | city | Tamil Nadu | India | 13.14 | 79.91 | 137 | 123743 |
| Thiruvanmiyur | city | Tamil Nadu | India | 12.99 | 80.26 | 39 | 1139277 |
| Thiruvellarai | city | Tamil Nadu | India | 10.96 | 78.67 | 334 | 51994 |
| Thiruvidaimaruthur | city | Tamil Nadu | India | 10.99 | 79.45 | 68 | 118239 |
| Thiruvārūr | city | Tamil Nadu | India | 10.77 | 79.63 | 9 | 82238 |
| Thoddimedu | city | Tamil Nadu | India | 13.42 | 80.26 | 22 | 0 |
| Thodhunter Nagar | city | Tamil Nadu | India | 13.02 | 80.23 | 52 | 2417248 |
| Thoothukkudi | city | Tamil Nadu | India | 8.81 | 78.15 | 16 | 9803 |
| Thoothukudi | city | Tamil Nadu | India | 8.81 | 78.15 | 16 | 9803 |
| Thoppukollai | city | Tamil Nadu | India | 13.38 | 80.17 | 26 | 38642 |
| Thoputorai | city | Tamil Nadu | India | 10.40 | 79.85 | 3 | 33076 |
| Thousand Lights | city | Tamil Nadu | India | 13.05 | 80.25 | 55 | 2561649 |
| Thulukarkandigai | city | Tamil Nadu | India | 13.28 | 80.01 | 127 | 38344 |
| Thulukkupālaiyam | city | Tamil Nadu | India | 13.30 | 80.17 | 49 | 57261 |
| Thyagaraya Nagar | city | Tamil Nadu | India | 13.04 | 80.24 | 45 | 2765140 |
| Thāndrāyankuppam | city | Tamil Nadu | India | 13.27 | 80.22 | 39 | 61582 |