| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 2451 | Siwan | Chapra Road SO | 📍 841226 | Siwan | Post Office - PO |
| 2452 | Siwan | Satation Road SO | 📍 841226 | Siwan | Post Office - PO |
| 2453 | Siwan | Siwan Chowk Bazar SO | 📍 841226 | Siwan | Post Office - PO |
| 2454 | Siwan | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 2455 | Siwan | S.S.Factory BO | 📍 841226 | Siwan | Branch Post Office |
| 2456 | Siwan | Siwan Mission House BO | 📍 841227 | Siwan | Branch Post Office |
| 2457 | Siwan Bigrah | Pakwalia BO | 📍 841238 | Daraundha | Branch Post Office |
| 2458 | Siwani | Patar BO | 📍 841502 | Andar | Branch Post Office |
| 2459 | Siwani Mathia | Patar BO | 📍 841502 | Raghunathpur | Branch Post Office |
| 2460 | Siwarajpur | Bhluwa BO | 📍 841404 | Barharia | Post Office - PO |
| 2461 | Siwdah Jalalpur | Jalalpur BO | 📍 841506 | Maharajganj | Branch Post Office |
| 2462 | Sobhan Chak | Keotalia BO | 📍 841234 | Darauli | Branch Post Office |
| 2463 | Sohagra | Sohgra BO | 📍 841239 | Guthani | Branch Post Office |
| 2464 | Sohagra Bazar | Sohgra BO | 📍 841239 | Guthani | Branch Post Office |
| 2465 | Sohagra Chauraha | Sohgra BO | 📍 841239 | Guthani | Branch Post Office |
| 2466 | Sohagra Kusuma | Sohgra BO | 📍 841239 | Guthani | Branch Post Office |
| 2467 | Sohagra Purab Patti | Sohgra BO | 📍 841239 | Guthani | Branch Post Office |
| 2468 | Sohagra Raniganj | Sohgra BO | 📍 841239 | Guthani | Branch Post Office |
| 2469 | Soharai | Talli BO | 📍 841239 | Guthani | Branch Post Office |
| 2470 | Sohil Patti | Sohilpatti BO | 📍 841406 | Basantpur | Branch Post Office |
| 2471 | Sohpur | Admapur BO | 📍 841504 | Raghunathpur | Branch Post Office |
| 2472 | Sohrai | Patar BO | 📍 841502 | Guthani | Branch Post Office |
| 2473 | Sonahaula | Bkulari BO | 📍 841239 | Guthani | Branch Post Office |
| 2474 | Sonahula | Hussainganj SO | 📍 841237 | Hussainganj | Post Office - PO |
| 2475 | Sonahula | Sematar BO | 📍 841239 | Guthani | Branch Post Office |
| 2476 | Sonapipar | Gambhria BO | 📍 841241 | Pachrukhi | Branch Post Office |
| 2477 | Sonbarsa | Jagdishpur BO | 📍 841203 | Siswan | Branch Post Office |
| 2478 | Sonbarsa | Nadiwan BO | 📍 841231 | Raghunathpur | Branch Post Office |
| 2479 | Sonbarsa | Darauli SO | 📍 841234 | Darauli | Post Office - PO |
| 2480 | Sonbarsa | Sareyarampur BO | 📍 841234 | Darauli | Branch Post Office |
| 2481 | Sonbarsa | Sonbarsa BO | 📍 841241 | Maharajganj | Branch Post Office |
| 2482 | Sonbarsa | Sahsrawan BO | 📍 841408 | Bhagwanpur Hat | Branch Post Office |
| 2483 | Sondhani | Sondhani BO | 📍 841408 | Bhagwanpur Hat | Branch Post Office |
| 2484 | Sonhani | Sondhani BO | 📍 841408 | Bhagwanpur Hat | Branch Post Office |
| 2485 | Sonkara Auwal | Santhi BO | 📍 841502 | Andar | Branch Post Office |
| 2486 | Sonkara sani | Santhi BO | 📍 841502 | Andar | Branch Post Office |
| 2487 | Sonurukha | Sohilpatti BO | 📍 841406 | Basantpur | Branch Post Office |
| 2488 | Sota | Pachrukhi SO | 📍 841241 | Pachrukhi | Post Office - PO |
| 2489 | sri nagar | Saidpura BO | 📍 841439 | Goriakothi | Branch Post Office |
| 2490 | Srikant Bangra Dindayalpur | Dindayalpur BO | 📍 841506 | Barharia | Branch Post Office |
| 2491 | Srikant Bangra Ke Tola Dindayalpur | Dindayalpur BO | 📍 841506 | Barharia | Branch Post Office |
| 2492 | Srikant Bangra Madhya Vidayalpur Dindayalpur | Dindayalpur BO | 📍 841506 | Barharia | Branch Post Office |
| 2493 | srinagar | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 2494 | Srinagar | Langarpura BO | 📍 841239 | Mairwa | Branch Post Office |
| 2495 | srirampur | Seotapur BO | 📍 841239 | Mairwa | Branch Post Office |
| 2496 | St road Mairwa | Mairwa SO | 📍 841239 | Mairwa | Post Office - PO |
| 2497 | Station Road | Station Road | 📍 841228 | Siwan | Sub Post Office |
| 2498 | Suahi | Noniapatti BO | 📍 841210 | Siswan | Branch Post Office |
| 2499 | Subhankar chapra | Gangpur Siswan SO | 📍 841210 | Siswan | Post Office - PO |
| 2500 | Sughari | Sughri BO | 📍 841406 | Bhagwanpur Hat | Branch Post Office |