| | | | | | STD Numbers of Tamil Nadu | |
| | Tamil Nadu Areas | STD Codes | Tiruvellore | 044 | Tiruvettipuram | 04182 | Trichy | 0431 | Tuticorin | 0461 | Udumalpet | 04252 | Ulundurpet | 04149 | Usiliampatti | 04552 | Uthangarai | 04341 | Valapady | 04292 | Valliyoor | 04637 | Vaniyambadi | 04174 | Vedasandur | 04551 | Vellore | 0416 | Velur | 04268 | Vilathikulam | 04638 | Villupuram | 04146 | Virudhachalam | 04143 | Virudhunagar | 04562 | Wandiwash | 04183 | Yercaud | 04281 |
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