| STD Codes for cities in Tamil Nadu | |
| City | Code |
| AMBASAMUDRAM | 4634 |
| ANAMALI | 4253 |
| ARAKANDANALLUR | 4153 |
| ARANTANGI | 4371 |
| ARAVAKURICHI | 4320 |
| ARIYALUR | 4329 |
| ARKONAM | 4177 |
| ARNI | 4173 |
| ARUPPUKOTTAI | 4566 |
| ATTUR | 4282 |
| AVANASHI | 4296 |
| BATLAGUNDU | 4543 |
| BHAVANI | 4256 |
| CHENGALPATTU | 44 |
| CHENGAM | 4188 |
| CHENNAI | 44 |
| CHIDAMBARAM | 4144 |
| COIMBATORE | 422 |
| CUDDALORE | 4142 |
| CUMBUM | 4554 |
| DENKANIKOITAH | 4347 |
| DEVAKOTTAI | 4561 |
| DHARAMPURAM | 4258 |
| DHARMAPURI | 4342 |
| DINDIGUL | 451 |
| ERODE | 424 |
| GINGEE | 4145 |
| GOBICHETTIPALAYAM | 4285 |
| GUDALUR | 4262 |
| GUDIYATHAM | 4171 |
| HARUR | 4346 |
| HOSUR | 4344 |
| JAYAMKONDAN | 4331 |
| KALLKURICHI | 4151 |
| KANCHIPURAM | 44 |
| KANGAYAM | 4257 |
| KARAIKAL | 4368 |
| KARAIKUDI | 4565 |
| KARUR | 4324 |
| KEERANUR | 4339 |
| KODAIKANAL | 4542 |
| KODUMUDI | 4204 |
| KOTAGIRI | 4266 |
| KOVILPATTI | 4632 |
| KRISHNAGIRI | 4343 |
| KULITHALAI | 4323 |
| KUMBAKONAM | 435 |
| KUZHITHURAI | 4651 |
| MADURAI | 452 |
| MADURANTGAM | 44 |
| MANAMADURAI | 4574 |
| MANAPARAI | 4332 |
| MANNARGUDI | 4367 |
| MAYILADUTJURAI | 4364 |
| METTUPALAYAM | 4254 |
| METTURDAM | 4298 |
| MUDUKULATHUR | 4576 |
| MULANUR | 4202 |
| MUSIRI | 4326 |
| NAGAPATTINAM | 4365 |
| NAGARCOIL | 4652 |
| NAMAKKAL | 4286 |
| NANGUNERI | 4635 |
| NATHAM | 4544 |
| ODDANCHATRAM | 4553 |
| OMALPUR | 4290 |
| OOTACAMUND | 423 |
| ORATHANAD | 4372 |
| PALACODE | 4348 |
| PALANI | 4545 |
| PALLADUM | 4255 |
| PAPANASAM | 4374 |
| PARAMAKUDI | 4564 |
| PATTUKOTTAI | 4373 |
| PERAMBALUR | 4328 |
| PERUNDURAI | 4294 |
| POLLACHI | 4259 |
| POLUR | 4181 |
| PONDICHERRY | 413 |
| PONNAMARAVATHI | 4333 |
| PONNERI | 44 |
| PUDUKKOTTAI | 4322 |
| RAJAPALAYAM | 4563 |
| RAMANATHPURAM | 4567 |
| RAMESHWARAM | 4573 |
| RANIPET | 4172 |
| RASIPURAM | 4287 |
| SALEM | 427 |
| SANKAGIRI | 4283 |
| SANKARAN KOIL | 4636 |
| SATHIYAMANGALAM | 4295 |
| SIVAGANGA | 4575 |
| SRIPERUMPUDUR | 44 |
| SRIVAIKUNDAM | 4630 |
| TENKASI | 4633 |
| THANJAVUR | 4362 |
| THENI | 4546 |
| THIRUMANGLAM | 4549 |
| THIRURAIPOONDI | 4369 |
| THURAIYURE | 4327 |
| TINDIVANAM | 4147 |
| TIRUCHENDUR | 4639 |
| TIRUCHENGODE | 4288 |
| TIRUNELVELLI | 462 |
| TIRUPATHUR | 4577 |
| TIRUPATTUR | 4179 |
| TIRUPUR | 421 |
| TIRUTTANI | 44 |
| TIRUVANNAMALAI | 4175 |
| TIRUVARUR | 4366 |
| TIRUVELLORE | 44 |
| TIRUVETTIPURAM | 4182 |
| TRICHY | 431 |
| TUTICORIN | 461 |
| UDUMALPET | 4252 |
| ULUNDURPET | 4149 |
| USILIAMPATTI | 4552 |
| UTHANGARAI | 4341 |
| VALAPADY | 4292 |
| VALLIYOOR | 4637 |
| VANIYAMBADI | 4174 |
| VEDASANDUR | 4551 |
| VELLORE | 416 |
| VELUR | 4268 |
| VILATHIKULAM | 4638 |
| VILLUPURAM | 4146 |
| VIRUDHACHALAM | 4143 |
| VIRUDHUNAGAR | 4562 |
| WANDIWASH | 4183 |
| YERCAUD | 4281 |