| | | | | | STD Numbers of Tamil Nadu | |
| | Tamil Nadu Areas | STD Codes | Ambasamudram | 04634 | Anamali | 04253 | Arakandanallur | 04153 | Arantangi | 04371 | Aravakurichi | 04320 | Ariyalur | 04329 | Arkonam | 04177 | Arni | 04173 | Aruppukottai | 04566 | Attur | 04282 | Avanashi | 04296 | Batlagundu | 04543 | Bhavani | 04256 | Chengalpattu | 044 | Chengam | 04188 | Chennai | 044 | Chidambaram | 04144 | Coimbatore | 0422 | Cuddalore | 04142 | Cumbum | 04554 | Denkanikoitah | 04347 | Devakottai | 04561 |
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