| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 2401 | Sikandar Pur Harijan Tola | Ratanpura BO | 📍 841506 | Maharajganj | Branch Post Office |
| 2402 | Sikandar Pur Koiri Tola | Ratanpura BO | 📍 841506 | Maharajganj | Branch Post Office |
| 2403 | Sikandar Pur Muslim Tola | Ratanpura BO | 📍 841506 | Maharajganj | Branch Post Office |
| 2404 | Sikandar Pur Singh Tola | Ratanpura BO | 📍 841506 | Maharajganj | Branch Post Office |
| 2405 | Sikandarpur | Sikandrpur BO | 📍 841434 | Barharia | Branch Post Office |
| 2406 | Sikandarpur | Ratanpura BO | 📍 841506 | Maharajganj | Branch Post Office |
| 2407 | Sikatia | Siktia BO | 📍 841244 | Maharajganj | Branch Post Office |
| 2408 | Sikatia | Khawaspur BO | 📍 841416 | Lakri Nabiganj | Branch Post Office |
| 2409 | Sikia | Sanjalpur BO | 📍 841245 | Ziradei | Branch Post Office |
| 2410 | Siktia | Siktia BO | 📍 841244 | Maharajganj | Branch Post Office |
| 2411 | Siktia Khap | Khawaspur BO | 📍 841416 | Lakri Nabiganj | Branch Post Office |
| 2412 | Simsimiya | Kachnar BO | 📍 841210 | Siswan | Branch Post Office |
| 2413 | Singahi | Hussainganj SO | 📍 841237 | Ziradei | Post Office - PO |
| 2414 | Singarpatti | Hussainganj SO | 📍 841237 | Hussainganj | Post Office - PO |
| 2415 | Singhauli | Singhauli BO | 📍 841507 | Bhagwanpur Hat | Branch Post Office |
| 2416 | Singhpur | Kashila BO | 📍 841287 | Andar | Branch Post Office |
| 2417 | Sipah | Basantpur SO Siwan | 📍 841406 | Basantpur | Post Office - PO |
| 2418 | Sipar | Singhauli BO | 📍 841507 | Bhagwanpur Hat | Branch Post Office |
| 2419 | Sirishtapur | Dhanuti BO | 📍 841226 | Siwan | Branch Post Office |
| 2420 | Sirisia | Sirisia BO | 📍 841243 | Mairwa | Branch Post Office |
| 2421 | Sirisiya | Sirisia BO | 📍 841243 | Mairwa | Branch Post Office |
| 2422 | Sirisiya | Sirisia BO | 📍 841413 | Nautan | Branch Post Office |
| 2423 | Sirkarpur | Srikalpur BO | 📍 841435 | Guthani | Branch Post Office |
| 2424 | Sirsaon | Daronda SO | 📍 841233 | Daraundha | Post Office - PO |
| 2425 | Sirsaon | Ramsapur BO | 📍 841233 | Daraundha | Branch Post Office |
| 2426 | sirsaon mathia | Daronda SO | 📍 841233 | Daraundha | Post Office - PO |
| 2427 | sirsaon naya toa | Daronda SO | 📍 841233 | Daraundha | Post Office - PO |
| 2428 | Sirsia | Barkamanjha BO | 📍 841243 | Mairwa | Branch Post Office |
| 2429 | sisahani | Sisahni BO | 📍 841245 | Ziradei | Branch Post Office |
| 2430 | Sisai | Laxmiganj Sisai BO | 📍 841506 | Goriakothi | Branch Post Office |
| 2431 | Sishwa Khurd | Lebhri BO | 📍 841239 | Mairwa | Branch Post Office |
| 2432 | Siswa | Barhria SO | 📍 841232 | Barharia | Post Office - PO |
| 2433 | Siswa | Siswan Kala BO | 📍 841236 | Siswan | Branch Post Office |
| 2434 | Siswa | Pachrukhi SO | 📍 841241 | Pachrukhi | Post Office - PO |
| 2435 | Siswa | Jagdishpur Kothi BO | 📍 841243 | Nautan | Branch Post Office |
| 2436 | Siswa | Bahadur Bazar BO | 📍 841404 | Goriakothi | Post Office - PO |
| 2437 | Siswa Buzurg | Anugrhnagar BO | 📍 841239 | Mairwa | Branch Post Office |
| 2438 | Siswa Khurd | Siswan Kala BO | 📍 841236 | Siswan | Branch Post Office |
| 2439 | Siswa Khurd | Anugrhnagar BO | 📍 841239 | Mairwa | Branch Post Office |
| 2440 | Siswan | Gangpur Siswan SO | 📍 841210 | Siswan | Post Office - PO |
| 2441 | Siswan | B.A. Pakwalia BO | 📍 841438 | Siswan | Branch Post Office |
| 2442 | Siswan east | Gangpur Siswan SO | 📍 841210 | Siswan | Post Office - PO |
| 2443 | Siswan Kalan | Gangpur Siswan SO | 📍 841210 | Siswan | Post Office - PO |
| 2444 | Sitalpur | Ramnagar BO | 📍 841504 | Raghunathpur | Branch Post Office |
| 2445 | Sitalpur | Gabhirar SO | 📍 841509 | Raghunathpur | Post Office - PO |
| 2446 | Sitalpura | English BO | 📍 841239 | Mairwa | Branch Post Office |
| 2447 | Sitalpura | Langarpura BO | 📍 841239 | Mairwa | Branch Post Office |
| 2448 | Siurajpur | Barhria SO | 📍 841232 | Barharia | Post Office - PO |
| 2449 | Siurajpur | Sadarpur BO | 📍 841232 | Barharia | Branch Post Office |
| 2450 | Siuri | Patar BO | 📍 841502 | Andar | Branch Post Office |