| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 401 | Barsav | Pak. Bakhtawar BO | 📍 272131 | Harraiya | Post Office - PO |
| 402 | Bartania | Lalganj Basti SO | 📍 272171 | Basti | Post Office - PO |
| 403 | Barwa | Bankatia BO | 📍 272151 | Basti | Branch Post Office |
| 404 | Barwadham | Purani Basti SO Basti | 📍 272002 | Basti | Branch Post Office |
| 405 | Barwaniya | Rautapar BO | 📍 272171 | Basti | Branch Post Office |
| 406 | Basaha | Chorkhari BO | 📍 272155 | Harraiya | Branch Post Office |
| 407 | Basaha | Kachhia BO | 📍 272163 | Harraiya | Branch Post Office |
| 408 | Basahiya | Tinich BO | 📍 272163 | Harraiya | Branch Post Office |
| 409 | Basahwa | Ajgaiba Jungle BO | 📍 272163 | Bhanpur | Branch Post Office |
| 410 | Basantpur | Bishesharganj SO | 📍 272128 | Harraiya | Post Office - PO |
| 411 | Basapar | Bankati Bazar SO | 📍 272123 | Basti | Post Office - PO |
| 412 | Basara | Banpur SO Basti | 📍 272177 | Basti | Post Office - PO |
| 413 | Basauka | Dasia BO | 📍 272150 | Bhanpur | Branch Post Office |
| 414 | Basauri | Bharwalia BO | 📍 272123 | Basti | Branch Post Office |
| 415 | Basavanpur | Jaitapur BO | 📍 272127 | Harraiya | Branch Post Office |
| 416 | Basdeela | Sihari Sardaha BO | 📍 272190 | Bhanpur | Branch Post Office |
| 417 | Basdeo Kunwar | Amari Bazar BO | 📍 272155 | Harraiya | Branch Post Office |
| 418 | Basdilia | Bharwalia BO | 📍 272123 | Bhanpur | Branch Post Office |
| 419 | Basdilia | Sangrampur BO | 📍 272127 | Bhanpur | Branch Post Office |
| 420 | Basdilia | Dasia BO | 📍 272150 | Bhanpur | Branch Post Office |
| 421 | Basdiliya | Puraina Pandey BO | 📍 272002 | Basti | Branch Post Office |
| 422 | Basevarai | Haribanshpur BO | 📍 272131 | Harraiya | Branch Post Office |
| 423 | Basgaun Urf Khazuhi | Siarapar BO | 📍 272182 | Basti | Branch Post Office |
| 424 | Bashkhor Kala | Sansarpur BO | 📍 272182 | Basti | Branch Post Office |
| 425 | Bashkhor Khurd | Kharka BO | 📍 272177 | Basti | Branch Post Office |
| 426 | Bashwa | Siarapar BO | 📍 272182 | Basti | Branch Post Office |
| 427 | Bashwa | Katya BO | 📍 272302 | Basti | Branch Post Office |
| 428 | Basin | Saithawalia BO | 📍 272002 | Basti | Branch Post Office |
| 429 | Basiya | Purani Basti SO Basti | 📍 272002 | Basti | Branch Post Office |
| 430 | Basoha | Tinich BO | 📍 272163 | Harraiya | Branch Post Office |
| 431 | Basthanva | Nedula BO | 📍 272130 | Harraiya | Branch Post Office |
| 432 | Basthanwa | Teliha Deeh BO | 📍 272190 | Bhanpur | Branch Post Office |
| 433 | Basti | Karahi BO | 📍 272002 | Basti | Branch Post Office |
| 434 | Basti Alawal | Asnahra SO | 📍 272194 | Bhanpur | Post Office - PO |
| 435 | Basti Nathu | Tusail BO | 📍 272194 | Bhanpur | Branch Post Office |
| 436 | Basti Sugar Factory | Basti Sugar Factory BO | 📍 272002 | Basti | Branch Post Office |
| 437 | Bastia | Lapsi BO | 📍 272190 | Bhanpur | Branch Post Office |
| 438 | Batauli | Dhirauli Babu BO | 📍 272127 | Harraiya | Branch Post Office |
| 439 | Batela | Orawara BO | 📍 272002 | Basti | Branch Post Office |
| 440 | Batela | Walterganj SO | 📍 272182 | Basti | Post Office - PO |
| 441 | Batholia | Gopinathpur BO | 📍 272130 | Harraiya | Branch Post Office |
| 442 | Battupur | Barhni BO | 📍 272131 | Basti | Branch Post Office |
| 443 | Baukha | Gauspur BO | 📍 272301 | Basti | Branch Post Office |
| 444 | Bauliya | Gaura BO | 📍 272002 | Basti | Branch Post Office |
| 445 | Bauluwa | Ojhaganj BO | 📍 272131 | Harraiya | Branch Post Office |
| 446 | Baya Pokhar | Sansarpur BO | 📍 272182 | Basti | Branch Post Office |
| 447 | Bayotahara | Kondra Pandey BO | 📍 272002 | Basti | Branch Post Office |
| 448 | Bdhya Raja | Delhwa BO | 📍 272301 | Basti | Branch Post Office |
| 449 | Bedipur | Vedipur BO | 📍 272181 | Harraiya | Branch Post Office |
| 450 | Beeran Katiya | Munderwa SO | 📍 272178 | Basti | Post Office - PO |