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| 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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