| | | | | | STD Numbers of Bihar | |
| | Bihar Areas | STD Codes | Motihari | 06252 | Motipur | 06223 | Muzaffarpur | 0621 | Nabinagar | 06332 | Narkatiaganj | 06253 | Naugachia | 06421 | Nawada | 06324 | Pakribarwan | 06325 | Pakridayal | 06259 | Patna | 0612 | Phulparas | 06277 | Piro | 06181 | Pupri | 06228 | Purena | 06454 | Rafiganj | 06327 | Rajauli | 06336 | Ramnagar | 06256 | Raniganj | 06461 | Raxaul | 06255 | Rohtas | 06188 | Rosera | 06275 | S.Bakhtiarpur | 06475 |
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