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| STD Numbers of Bihar | | |
| | | Bihar Areas | STD Codes | | Saharsa | 06478 | | Samastipur | 06274 | | Sasaram | 06184 | | Seikhpura | 06341 | | Sheohar | 06222 | | Sherghati | 06326 | | Sidhawalia | 06151 | | Singhwara | 06247 | | Sitamarhi | 06226 | | Siwan | 06154 | | Sonepur | 06158 | | Supaul | 06473 | | Thakurganj | 06459 | | Triveniganj | 06477 | | Udakishanganj | 06479 | | Wazirganj | 06322 |
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