| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 2301 | Sarari | Sarari BO | 📍 841434 | Goriakothi | Branch Post Office |
| 2302 | Saraut | Bhagar BO | 📍 841210 | Siswan | Branch Post Office |
| 2303 | Sarauti | Sarauti BO | 📍 841241 | Pachrukhi | Branch Post Office |
| 2304 | Sarauti shauth Tola | Sarauti BO | 📍 841241 | Pachrukhi | Branch Post Office |
| 2305 | Sarauti West tola | Sarauti BO | 📍 841241 | Pachrukhi | Branch Post Office |
| 2306 | Saray Panrauli | Ratanparauli BO | 📍 841242 | Bhagwanpur Hat | Branch Post Office |
| 2307 | Saraya Ahir Tola | Saraya Sah Mohamd BO | 📍 841506 | Goriakothi | Branch Post Office |
| 2308 | Saraya Sah Mohamad | Saraya Sah Mohamd BO | 📍 841506 | Goriakothi | Branch Post Office |
| 2309 | Sarea | Sareyarampur BO | 📍 841234 | Guthani | Branch Post Office |
| 2310 | Sarea | Hussainganj SO | 📍 841237 | Hussainganj | Post Office - PO |
| 2311 | Sarea | Pipra BO | 📍 841244 | Maharajganj | Branch Post Office |
| 2312 | Sarea | Basantpur SO Siwan | 📍 841406 | Bhagwanpur Hat | Post Office - PO |
| 2313 | Sarea | Mustfabad SO | 📍 841439 | Goriakothi | Post Office - PO |
| 2314 | Sarea Sirikant | Basantpur SO Siwan | 📍 841406 | Basantpur | Post Office - PO |
| 2315 | Sareya Srikant | Hussaipurnand BO | 📍 841406 | Basantpur | Branch Post Office |
| 2316 | Sarfora | Talli BO | 📍 841239 | Guthani | Branch Post Office |
| 2317 | Sarharwa | Sarhrwa BO | 📍 841239 | Mairwa | Branch Post Office |
| 2318 | Sarharwa Babu tola | Sarhrwa BO | 📍 841239 | Darauli | Branch Post Office |
| 2319 | Sarharwa Jolha Tola | Sarhrwa BO | 📍 841239 | Darauli | Branch Post Office |
| 2320 | Sarharwa Mathia | Sarhrwa BO | 📍 841239 | Darauli | Branch Post Office |
| 2321 | Sarharwa Pandit tola | Sarhrwa BO | 📍 841239 | Mairwa | Branch Post Office |
| 2322 | Saripatti | Bhagwanpur Hat SO | 📍 841408 | Bhagwanpur Hat | Post Office - PO |
| 2323 | Sarmari Bagra | Krom BO | 📍 841239 | Darauli | Branch Post Office |
| 2324 | Sarna | Bishwania BO | 📍 841234 | Darauli | Branch Post Office |
| 2325 | Sarphora | Talli BO | 📍 841239 | Guthani | Branch Post Office |
| 2326 | Sarsa | Bhantapokher BO | 📍 841226 | Siwan | Branch Post Office |
| 2327 | Sarsar | Sarsar BO | 📍 841226 | Siwan | Branch Post Office |
| 2328 | Sarsar BO | Sarsar BO | 📍 841228 | Siwan | Branch Post Office |
| 2329 | Sarswati Gayan Mandir | Pipra Naryan BO | 📍 841506 | Pachrukhi | Branch Post Office |
| 2330 | Sarwjanik Pustkalay Dindayalpur | Dindayalpur BO | 📍 841506 | Barharia | Branch Post Office |
| 2331 | Sarya | Pipra BO | 📍 841244 | Maharajganj | Branch Post Office |
| 2332 | Sathwar | Sahatwar BO | 📍 841439 | Goriakothi | Branch Post Office |
| 2333 | Satjora | Bhikha Bandh Satjora BO | 📍 841244 | Daraundha | Branch Post Office |
| 2334 | Satjora Mathia | Bhikha Bandh Satjora BO | 📍 841244 | Daraundha | Branch Post Office |
| 2335 | Satwar | Sahatwar BO | 📍 841439 | Goriakothi | Branch Post Office |
| 2336 | Sauna | Goreakothi SO | 📍 841434 | Goriakothi | Post Office - PO |
| 2337 | Sauna | Sawana BO | 📍 841438 | Barharia | Branch Post Office |
| 2338 | saushar | Sagar Sultanpur BO | 📍 841417 | Siwan | Branch Post Office |
| 2339 | Sauya Road Basantpur | Basantpur SO Siwan | 📍 841406 | Basantpur | Post Office - PO |
| 2340 | Sawasth Kendra Bharatpura Mathia | Bhartpura BO | 📍 841506 | Pachrukhi | Branch Post Office |
| 2341 | SBI Ziradei | Zeradei SO | 📍 841245 | Ziradei | Post Office - PO |
| 2342 | Sekhpura | Sekhpura BO | 📍 841406 | Basantpur | Branch Post Office |
| 2343 | Sekhpurwa | Mahuwal Mahal SO | 📍 841240 | Hasanpura | Post Office - PO |
| 2344 | selara | Sahuli BO | 📍 841286 | Hasanpura | Branch Post Office |
| 2345 | Selaur | Guthni SO | 📍 841435 | Guthani | Post Office - PO |
| 2346 | Semara Tola | B.P.Ekderwsa BO | 📍 841243 | Nautan | Branch Post Office |
| 2347 | Semardah | Sahrkola BO | 📍 841406 | Basantpur | Branch Post Office |
| 2348 | Semaria | Semaria BO | 📍 841243 | Nautan | Branch Post Office |
| 2349 | Sematar | Sematar BO | 📍 841239 | Guthani | Branch Post Office |
| 2350 | Semra | Anugrhnagar BO | 📍 841239 | Mairwa | Branch Post Office |