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| 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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