| | | | | | 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 |
| |
| | | | |
|