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| STD Numbers of Bihar | |
| | Bihar Areas | STD Codes | Adhaura | 06180 | Amarpur | 06420 | Araria | 06453 | Areraj | 06258 | Arrah | 06182 | Arwal | 06337 | Aurangabad | 06186 | Bagaha | 06251 | Banka | 06424 | Banmankhi | 06467 | Barachakia | 06257 | Barauni | 06279 | Barh | 06132 | Barosi | 06451 | Begusarai | 06243 | Benipatti | 06271 | Benipur | 06242 | Bettiah | 06254 | Bhabhua | 06189 | Bhagalpur | 0641 | Bidupur | 06229 | Biharsharif | 06112 |
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