| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 401 | Rohuamon | Bangaon SO Saharsa | 📍 852212 | Kahara | Post Office - PO |
| 402 | Rupnagar | Rupanagar BO | 📍 852202 | Kahara | Branch Post Office |
| 403 | Rupnagar | Saharsa Collec. SO | 📍 852202 | Kahara | Branch Post Office |
| 404 | Sadhua Badh | Panchgachiya SO | 📍 852124 | Satar Kataiya | Post Office - PO |
| 405 | Sahgaura | Dhabauli SO | 📍 852107 | Patarghat | Post Office - PO |
| 406 | Sahmaura | Sahsoul BO | 📍 852129 | Sonbarsa | Branch Post Office |
| 407 | Sahoria | Alani BO | 📍 852126 | Salkhua | Branch Post Office |
| 408 | Sahorwa | Terhi BO | 📍 852216 | Mahishi | Branch Post Office |
| 409 | Sahsaili Thuthi | Salkhua Bazar SO | 📍 852126 | Salkhua | Post Office - PO |
| 410 | Sahsaul | Sahsoul BO | 📍 852129 | Sonbarsa | Branch Post Office |
| 411 | Sahuria | Alani BO | 📍 852126 | Banma Itahri | Branch Post Office |
| 412 | Sahuria | Sahuria BO | 📍 852221 | Saur Bazar | Branch Post Office |
| 413 | Salkhua | Koparia BO | 📍 852126 | Salkhua | Branch Post Office |
| 414 | Salkhua | Mobarakpur BO | 📍 852126 | Salkhua | Branch Post Office |
| 415 | Salkhua | Salkhua Bazar SO | 📍 852126 | Salkhua | Post Office - PO |
| 416 | Samani | Telwa BO | 📍 852216 | Mahishi | Branch Post Office |
| 417 | Samhar Kalan | Salkhua Bazar SO | 📍 852126 | Salkhua | Post Office - PO |
| 418 | Samhar Khurd | Salkhua Bazar SO | 📍 852126 | Salkhua | Post Office - PO |
| 419 | Sapaita | Telhar BO | 📍 852216 | Mahishi | Branch Post Office |
| 420 | Sarauni | Sarauni BO | 📍 852216 | Mahishi | Branch Post Office |
| 421 | Sarauni Khurd | Sarauni BO | 📍 852216 | Mahishi | Branch Post Office |
| 422 | Sarauni Madhepura | Sahsoul BO | 📍 852129 | Sonbarsa | Branch Post Office |
| 423 | Saraunja | Saronja BO | 📍 852106 | Simri Bakhtiarpur | Branch Post Office |
| 424 | Saraunja Thana Sitanabad | Sitanabad BO | 📍 852106 | Simri Bakhtiarpur | Branch Post Office |
| 425 | Sarbela | Sarbella BO | 📍 852127 | Banma Itahri | Branch Post Office |
| 426 | Sardiha | Sardiha BO | 📍 852127 | Simri Bakhtiarpur | Branch Post Office |
| 427 | Satar Kataiya | Sattar BO | 📍 852124 | Satar Kataiya | Branch Post Office |
| 428 | Sataur | Narayanpur BO | 📍 852216 | Nauhatta | Branch Post Office |
| 429 | Sattar | Panchgachiya SO | 📍 852124 | Satar Kataiya | Post Office - PO |
| 430 | Saur | Sour Bazar SO | 📍 852221 | Saur Bazar | Post Office - PO |
| 431 | Saur Bazar | Damgarhi BO | 📍 852221 | Saur Bazar | Branch Post Office |
| 432 | Saur Bazar | Sour Bazar SO | 📍 852221 | Saur Bazar | Post Office - PO |
| 433 | Sauthi | Sarbella BO | 📍 852127 | Salkhua | Branch Post Office |
| 434 | Semar | Kundah BO | 📍 852216 | Mahishi | Branch Post Office |
| 435 | Seoti | Kabira BO | 📍 852106 | Salkhua | Branch Post Office |
| 436 | Shahganwan | Gordah BO | 📍 852127 | Salkhua | Branch Post Office |
| 437 | Shahpur | Shahpur Manjhol BO | 📍 852123 | Nauhatta | Branch Post Office |
| 438 | Shahpur | Panchgachiya SO | 📍 852124 | Satar Kataiya | Post Office - PO |
| 439 | Shahpur | Sonbersa Raj SO | 📍 852129 | Sonbarsa | Post Office - PO |
| 440 | Shamsuddinpur | Paharpur BO | 📍 852127 | Banma Itahri | Branch Post Office |
| 441 | Shankarpur | Shankarpur BO | 📍 852106 | Simri Bakhtiarpur | Branch Post Office |
| 442 | Sihaul | Sihaul BO | 📍 852124 | Satar Kataiya | Branch Post Office |
| 443 | Silet | Sour Bazar SO | 📍 852221 | Saur Bazar | Post Office - PO |
| 444 | Simraha | Simraha BO | 📍 852202 | Kahara | Branch Post Office |
| 445 | Simri | Simri BO | 📍 852127 | Simri Bakhtiarpur | Branch Post Office |
| 446 | Simri Bakhtiarpur | Goriari BO | 📍 852127 | Simri Bakhtiarpur | Branch Post Office |
| 447 | Simri Bakhtiarpur | Simri Bakhtiarpur SO | 📍 852127 | Simri Bakhtiarpur | Post Office - PO |
| 448 | Siradipatti | B.S.Patti BO | 📍 852202 | Kahara | Branch Post Office |
| 449 | Sirrahi | Sonbersa Raj SO | 📍 852129 | Sonbarsa | Post Office - PO |
| 450 | Sirwar | Maina Gram BO | 📍 852216 | Mahishi | Branch Post Office |