| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 501 | Bishunpura | English BO | 📍 841239 | Mairwa | Branch Post Office |
| 502 | Bishunpura | Punak BO | 📍 841239 | Mairwa | Branch Post Office |
| 503 | Bishunpura | Sohgra BO | 📍 841239 | Guthani | Branch Post Office |
| 504 | Bishunpura | Jagdishpur Kothi BO | 📍 841243 | Nautan | Branch Post Office |
| 505 | Bishunpura | Baijubarhoga BO | 📍 841406 | Basantpur | Branch Post Office |
| 506 | Bishunpura | Sekhpura BO | 📍 841406 | Basantpur | Branch Post Office |
| 507 | Bishunpura | Paikauli Baddo BO | 📍 841438 | Barharia | Branch Post Office |
| 508 | Bishunpura | Raghunathpur SO Siwan | 📍 841504 | Raghunathpur | Post Office - PO |
| 509 | Bishunpura | Newari BO | 📍 841509 | Raghunathpur | Branch Post Office |
| 510 | Bishunpurwa | Sarsar BO | 📍 841226 | Siwan | Branch Post Office |
| 511 | Bishwambhar PUr | Goreakothi SO | 📍 841434 | Goriakothi | Post Office - PO |
| 512 | Bishwania | Bishwania BO | 📍 841234 | Darauli | Branch Post Office |
| 513 | Bishwar | Bishwar BO | 📍 841239 | Guthani | Branch Post Office |
| 514 | Biswania | Bishwania BO | 📍 841234 | Darauli | Branch Post Office |
| 515 | Biswar | Bishwar BO | 📍 841239 | Guthani | Branch Post Office |
| 516 | Bithuna | Bithuna BO | 📍 841507 | Bhagwanpur Hat | Branch Post Office |
| 517 | Brit Bagahi | Baghi BO | 📍 841406 | Basantpur | Branch Post Office |
| 518 | Brit Bagahi | Baijubarhoga BO | 📍 841406 | Basantpur | Branch Post Office |
| 519 | Brit tola | Bhikha Bandh Satjora BO | 📍 841244 | Daraundha | Branch Post Office |
| 520 | Briti Tola | B.P.Ekderwsa BO | 📍 841243 | Nautan | Branch Post Office |
| 521 | Budhia mai mandir | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 522 | Budhu Chapra | Shakara BO | 📍 841506 | Maharajganj | Branch Post Office |
| 523 | Budhu Chhapra | Barkagaon BO | 📍 841226 | Pachrukhi | Branch Post Office |
| 524 | Canara Bank Ziradei | Zeradei SO | 📍 841245 | Ziradei | Post Office - PO |
| 525 | CBI Ziradei | Zeradei SO | 📍 841245 | Ziradei | Post Office - PO |
| 526 | Central Bank of India | Madhopur BO | 📍 841506 | Maharajganj | Branch Post Office |
| 527 | Central Bank Tarwara | Tarwara SO | 📍 841506 | Pachrukhi | Post Office - PO |
| 528 | Chachopali | Saraya Sah Mohamd BO | 📍 841506 | Goriakothi | Branch Post Office |
| 529 | Chachopali Babu Tola | Saraya Sah Mohamd BO | 📍 841506 | Goriakothi | Branch Post Office |
| 530 | Chachopali Harijan Tola | Saraya Sah Mohamd BO | 📍 841506 | Goriakothi | Branch Post Office |
| 531 | Chachopali Upkendra | Saraya Sah Mohamd BO | 📍 841506 | Goriakothi | Branch Post Office |
| 532 | chaghetia | Sagar Sultanpur BO | 📍 841417 | Bhagwanpur Hat | Branch Post Office |
| 533 | Chain Bhagat Ke Tola | Balia BO | 📍 841506 | Maharajganj | Branch Post Office |
| 534 | Chain Chhapra | Bishwar BO | 📍 841239 | Guthani | Branch Post Office |
| 535 | Chain Chhapra | Hardia BO | 📍 841404 | Barharia | Post Office - PO |
| 536 | Chainpatti | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 537 | Chainpur | Chainpur SO Siwan | 📍 841203 | Siswan | Post Office - PO |
| 538 | Chainpur | Agya BO | 📍 841439 | Goriakothi | Branch Post Office |
| 539 | Chainpur | Chainpur BO | 📍 841439 | Goriakothi | Branch Post Office |
| 540 | Chainpur | Chakia BO | 📍 841507 | Bhagwanpur Hat | Branch Post Office |
| 541 | Chainpur Alinagar | Barhria SO | 📍 841232 | Barharia | Post Office - PO |
| 542 | Chainpur dakshini | Chainpur Hata BO | 📍 841243 | Nautan | Branch Post Office |
| 543 | Chainpur Hata | Chainpur Hata BO | 📍 841243 | Nautan | Branch Post Office |
| 544 | Chainpur Mobarakpur | Chainpur SO Siwan | 📍 841203 | Siswan | Post Office - PO |
| 545 | Chaiyan Pali | Choiapali BO | 📍 841242 | Bhagwanpur Hat | Branch Post Office |
| 546 | Chaiyapali | Paterhi SO | 📍 841242 | Maharajganj | Post Office - PO |
| 547 | Chak Damri | Ramnagar BO | 📍 841504 | Hasanpura | Branch Post Office |
| 548 | Chak Daula | Raghunathpur SO Siwan | 📍 841504 | Raghunathpur | Post Office - PO |
| 549 | Chak Haibat | Siswan Kala BO | 📍 841236 | Siswan | Branch Post Office |
| 550 | Chak Hazi | Faridpur BO | 📍 841231 | Hussainganj | Branch Post Office |