| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 2201 | Rukundipur Mathia | Bhikha Bandh Satjora BO | 📍 841244 | Daraundha | Branch Post Office |
| 2202 | S B I SIWAN | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 2203 | S D O court | Siwan HO | 📍 841226 | Siwan | Head Post Office - H |
| 2204 | Sabh hata | Gabhirar SO | 📍 841509 | Raghunathpur | Post Office - PO |
| 2205 | Sabha | Mairwa SO | 📍 841239 | Mairwa | Post Office - PO |
| 2206 | Sachipur | Pachokhar BO | 📍 841245 | Ziradei | Branch Post Office |
| 2207 | Sadalpur | Shiopur Sakra BO | 📍 841245 | Ziradei | Branch Post Office |
| 2208 | Sadalpur | Asaon SO | 📍 841287 | Andar | Post Office - PO |
| 2209 | Sadarpur | Sadarpur BO | 📍 841232 | Barharia | Branch Post Office |
| 2210 | Saddikpur | Pachrukhi SO | 📍 841241 | Pachrukhi | Post Office - PO |
| 2211 | Sadhpur | Dighwalia BO | 📍 841203 | Raghunathpur | Branch Post Office |
| 2212 | Sadhpur | Ramsapur BO | 📍 841233 | Daraundha | Branch Post Office |
| 2213 | Sadhpur harijan colony | Ramsapur BO | 📍 841233 | Daraundha | Branch Post Office |
| 2214 | Sadiha | Sadiha BO | 📍 841507 | Bhagwanpur Hat | Branch Post Office |
| 2215 | Sadipur | Goreakothi SO | 📍 841434 | Goriakothi | Post Office - PO |
| 2216 | Safdapur Tola | Barhria SO | 📍 841232 | Barharia | Post Office - PO |
| 2217 | Safichara | Barhria SO | 📍 841232 | Barharia | Post Office - PO |
| 2218 | Sagara | Semaria BO | 📍 841243 | Nautan | Branch Post Office |
| 2219 | Saghar Sultanpur | Basantpur SO Siwan | 📍 841406 | Bhagwanpur Hat | Post Office - PO |
| 2220 | Saghar Sultanpur | Sagar Sultanpur BO | 📍 841417 | Bhagwanpur Hat | Branch Post Office |
| 2221 | Sagher | Sughri BO | 📍 841406 | Bhagwanpur Hat | Branch Post Office |
| 2222 | Sagher Sultanpur | Sughri BO | 📍 841406 | Bhagwanpur Hat | Branch Post Office |
| 2223 | Sagna | Makariyar BO | 📍 841245 | Ziradei | Branch Post Office |
| 2224 | Sagra | Semaria BO | 📍 841441 | Nautan | Branch Post Office |
| 2225 | Sah Sahib Tola Chaukihasan | Chaukihasan BO | 📍 841506 | Barharia | Branch Post Office |
| 2226 | Sahajania Punak | Punak BO | 📍 841239 | Darauli | Branch Post Office |
| 2227 | Sahar Kola | Sahrkola BO | 📍 841406 | Basantpur | Branch Post Office |
| 2228 | Sahba Chak | Tethli BO | 📍 841232 | Barharia | Post Office - PO |
| 2229 | Sahba Chak | Hardia BO | 📍 841404 | Barharia | Post Office - PO |
| 2230 | Sahdulepur | Partap Pur BO | 📍 841226 | Hussainganj | Branch Post Office |
| 2231 | Sahilpatti | Sohilpatti BO | 📍 841406 | Basantpur | Branch Post Office |
| 2232 | Sahimpur | Panjwar BO | 📍 841509 | Raghunathpur | Branch Post Office |
| 2233 | Sahinpur Akathi | Panjwar BO | 📍 841509 | Raghunathpur | Branch Post Office |
| 2234 | Sahjaniya | Tariwani BO | 📍 841235 | Darauli | Branch Post Office |
| 2235 | Sahlaur | Sahlaur BO | 📍 841227 | Pachrukhi | Branch Post Office |
| 2236 | Sahsa | Lawa Rampur BO | 📍 841507 | Bhagwanpur Hat | Branch Post Office |
| 2237 | Sahsaraon | Asaon SO | 📍 841287 | Andar | Post Office - PO |
| 2238 | Sahsaraon | Sahsrawan BO | 📍 841408 | Bhagwanpur Hat | Branch Post Office |
| 2239 | Sahtola | Barkagaowan BO | 📍 841408 | Bhagwanpur Hat | Branch Post Office |
| 2240 | Sahuli | Sahuli BO | 📍 841286 | Hasanpura | Branch Post Office |
| 2241 | Saichani | Dighwalia BO | 📍 841203 | Raghunathpur | Branch Post Office |
| 2242 | Saichani Tola | Dighwalia BO | 📍 841203 | Raghunathpur | Branch Post Office |
| 2243 | Saidpur | Nadiwan BO | 📍 841231 | Raghunathpur | Branch Post Office |
| 2244 | Saidpur | Nabiganj BO | 📍 841407 | Lakri Nabiganj | Post Office - PO |
| 2245 | Saidpura | Saidpura BO | 📍 841439 | Goriakothi | Branch Post Office |
| 2246 | Sainpur | Gangpur Siswan SO | 📍 841210 | Siswan | Post Office - PO |
| 2247 | Sainpur Diara | Gayaspur BO | 📍 841210 | Siswan | Branch Post Office |
| 2248 | Sajot | Basantpur SO Siwan | 📍 841406 | Bhagwanpur Hat | Post Office - PO |
| 2249 | Salahpur | Andar SO | 📍 841231 | Andar | Post Office - PO |
| 2250 | Salahpur | Dindayalpur BO | 📍 841506 | Barharia | Branch Post Office |