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| 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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