| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 451 | Bhulauni | Semaria BO | 📍 841243 | Nautan | Branch Post Office |
| 452 | Bhuli Chakri | Khujhwa SO | 📍 841502 | Raghunathpur | Post Office - PO |
| 453 | Bhulli Chakri | Nand Pur Amwari BO | 📍 841231 | Raghunathpur | Branch Post Office |
| 454 | Bhushitola | Patar BO | 📍 841502 | Andar | Branch Post Office |
| 455 | Bhusi | Mahuwal Mahal SO | 📍 841240 | Daraundha | Post Office - PO |
| 456 | Bibsain Bhabhra | Mairwa SO | 📍 841239 | Mairwa | Post Office - PO |
| 457 | Bibunpura | Punak BO | 📍 841239 | Darauli | Branch Post Office |
| 458 | Bichala KHalwa | Khalwa BO | 📍 841243 | Nautan | Branch Post Office |
| 459 | Bichali Bazar Mairwa | Mairwa SO | 📍 841239 | Mairwa | Post Office - PO |
| 460 | Bichali Patti Chaukihasan | Chaukihasan BO | 📍 841506 | Barharia | Branch Post Office |
| 461 | Bidurtihatta | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 462 | Bihar home guard | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 463 | Bihari Buzurg | Tenua BO | 📍 841435 | Guthani | Branch Post Office |
| 464 | Bihari Khurd | Tenua BO | 📍 841435 | Guthani | Branch Post Office |
| 465 | Bihsunpura | Jogapur Kothi BO | 📍 841413 | Barharia | Branch Post Office |
| 466 | Bijaipur | Akolhi BO | 📍 841239 | Mairwa | Branch Post Office |
| 467 | Bijaipur | Goreakothi SO | 📍 841434 | Goriakothi | Post Office - PO |
| 468 | Bijehata | Gaushalaroad Siwan SO | 📍 841227 | Pachrukhi | Post Office - PO |
| 469 | Bijulia | Asaon SO | 📍 841287 | Andar | Post Office - PO |
| 470 | Bikaur | Piprahiya BO | 📍 841245 | Ziradei | Branch Post Office |
| 471 | Bikrampur Diara | Jaijore BO | 📍 841231 | Andar | Branch Post Office |
| 472 | Bilak | Darauli SO | 📍 841234 | Darauli | Post Office - PO |
| 473 | Bilashpur | Bilaspur BO | 📍 841239 | Mairwa | Branch Post Office |
| 474 | Bilaspur | Bhikhpur BO | 📍 841408 | Bhagwanpur Hat | Branch Post Office |
| 475 | Bin toli | Bharuli BO | 📍 841245 | Ziradei | Branch Post Office |
| 476 | Bindwal | Badram BO | 📍 841241 | Hussainganj | Branch Post Office |
| 477 | Bindwal | Chainpur BO | 📍 841439 | Goriakothi | Branch Post Office |
| 478 | Bintola | Gabhirar SO | 📍 841509 | Raghunathpur | Post Office - PO |
| 479 | Bira Bankat | Bhagwanpur Hat SO | 📍 841408 | Bhagwanpur Hat | Post Office - PO |
| 480 | Bira Bankat | Bankat BO | 📍 841422 | Bhagwanpur Hat | Branch Post Office |
| 481 | Bira Tola | Hatimpur BO | 📍 841413 | Barharia | Branch Post Office |
| 482 | Birt Bagahi | Bhagwanpur Hat SO | 📍 841408 | Bhagwanpur Hat | Post Office - PO |
| 483 | Birti | Gangpur Siswan SO | 📍 841210 | Siswan | Post Office - PO |
| 484 | Birti Lakheraj | Ramgarh BO | 📍 841203 | Siswan | Branch Post Office |
| 485 | Birti tola | Bhikha Bandh Satjora BO | 📍 841244 | Daraundha | Branch Post Office |
| 486 | Birti Tola | Bakerganj SO | 📍 841286 | Hasanpura | Post Office - PO |
| 487 | Birti tola | Goreakothi SO | 📍 841434 | Goriakothi | Post Office - PO |
| 488 | Birti tola | Chainpur BO | 📍 841439 | Goriakothi | Branch Post Office |
| 489 | Bishambharpur | Laheji BO | 📍 841233 | Hasanpura | Branch Post Office |
| 490 | Bishambharpur | Harihar Pur Lalgarh BO | 📍 841434 | Barharia | Branch Post Office |
| 491 | Bishambharpur | Mirja Pur BO | 📍 841436 | Nautan | Branch Post Office |
| 492 | Bishrampur | Keelpur BO | 📍 841243 | Nautan | Branch Post Office |
| 493 | Bishundas Chak | Dighwalia BO | 📍 841203 | Raghunathpur | Branch Post Office |
| 494 | Bishundas chowk | Bhikhpur Bhgwanpur BO | 📍 841236 | Siswan | Branch Post Office |
| 495 | Bishunpur | Sarsar BO | 📍 841226 | Siwan | Branch Post Office |
| 496 | Bishunpur | Titra BO | 📍 841245 | Ziradei | Branch Post Office |
| 497 | Bishunpur Mahuari | Mahrajganj SO Siwan | 📍 841238 | Maharajganj | Post Office - PO |
| 498 | Bishunpura | Kachnar BO | 📍 841210 | Siswan | Branch Post Office |
| 499 | Bishunpura | Bishunpura BO | 📍 841238 | Daraundha | Branch Post Office |
| 500 | Bishunpura | Bishunpura Bazar BO | 📍 841239 | Mairwa | Branch Post Office |