| | | | | | STD Numbers of Tamil Nadu | |
| | Tamil Nadu Areas | STD Codes | Dharampuram | 04258 | Dharmapuri | 04342 | Dindigul | 0451 | Erode | 0424 | Gingee | 04145 | Gobichettipalayam | 04285 | Gudalur | 04262 | Gudiyatham | 04171 | Harur | 04346 | Hosur | 04344 | Jayamkondan | 04331 | Kallkurichi | 04151 | Kanchipuram | 044 | Kangayam | 04257 | Karaikal | 04368 | Karaikudi | 04565 | Karur | 04324 | Keeranur | 04339 | Kodaikanal | 04542 | Kodumudi | 04204 | Kotagiri | 04266 | Kovilpatti | 04632 |
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