| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 601 | Keshopur | Bachharpur BO | 📍 843320 | Pupri | Branch Post Office |
| 602 | Khaguriya | Parsauni BO | 📍 843302 | Parsauni | Branch Post Office |
| 603 | Khairwa | Maniyari BO | 📍 843302 | Dumra | Branch Post Office |
| 604 | Khairwa | Khairwa BO | 📍 843327 | Riga | Branch Post Office |
| 605 | Khairwa | Rewasi BO | 📍 843327 | Riga | Branch Post Office |
| 606 | Khairwa | Malahi BO | 📍 843331 | Majorganj | Branch Post Office |
| 607 | Khairwan Malahi | Phulhatta BO | 📍 843324 | Parihar | Branch Post Office |
| 608 | Khap Khopraha urf Gobraha | Bhutahi SO | 📍 843317 | Sonbarsa | Post Office - PO |
| 609 | Khap Khopraha urf Gobraha | K. Bhandar BO | 📍 843317 | Sonbarsa | Post Office - PO |
| 610 | Kharka | Punaura BO | 📍 843302 | Dumra | Branch Post Office |
| 611 | Kharka | Rain Shankar BO | 📍 843328 | Runisaidpur | Branch Post Office |
| 612 | Kharka | Runnisaidpur SO | 📍 843328 | Runisaidpur | Post Office - PO |
| 613 | Kharka Basant | Saterh BO | 📍 843318 | Bokhara | Branch Post Office |
| 614 | Kharka Basant | Kharkha BO | 📍 847302 | Bokhara | Branch Post Office |
| 615 | Kharsan | Kharsan BO | 📍 843327 | Riga | Branch Post Office |
| 616 | Khopa | Athri SO | 📍 843311 | Runisaidpur | Post Office - PO |
| 617 | Khopa | Garha BO | 📍 843323 | Runisaidpur | Branch Post Office |
| 618 | Khopa | B. Dhanushi BO | 📍 843323 | Runisaidpur | Branch Post Office |
| 619 | Khoria | Choraut SO | 📍 843319 | Charaut | Post Office - PO |
| 620 | Khoria | Koryahi BO | 📍 843319 | Charaut | Branch Post Office |
| 621 | Khuksi | Lahuriya BO | 📍 843324 | Parihar | Branch Post Office |
| 622 | Khursaha | Lahuriya BO | 📍 843324 | Parihar | Branch Post Office |
| 623 | Kirathpur | Chandwara BO | 📍 843328 | Runisaidpur | Branch Post Office |
| 624 | Kishunpur Taufir | Kishanpur BO | 📍 843302 | Bathnaha | Branch Post Office |
| 625 | Kodaria | Lalpur BO | 📍 843323 | Runisaidpur | Branch Post Office |
| 626 | Kodaria | Manikchowk SO | 📍 843323 | Runisaidpur | Post Office - PO |
| 627 | Kodarkat | Singrahiya BO | 📍 843317 | Bathnaha | Branch Post Office |
| 628 | Kodwara | Chhaurahiya BO | 📍 843332 | Bathnaha | Branch Post Office |
| 629 | Kohbarwa | Kohbarawa BO | 📍 843330 | Sonbarsa | Branch Post Office |
| 630 | Koili | Koily BO | 📍 843302 | Bathnaha | Branch Post Office |
| 631 | Kokna | Parmanandpur BO | 📍 843302 | Dumra | Branch Post Office |
| 632 | Kopi | Manikchowk SO | 📍 843323 | Runisaidpur | Post Office - PO |
| 633 | Kopi | B. Dhanushi BO | 📍 843323 | Runisaidpur | Branch Post Office |
| 634 | Kopi Nisf | B. Dhanushi BO | 📍 843323 | Runisaidpur | Branch Post Office |
| 635 | Kora Khargi | Bhulli BO | 📍 843325 | Parsauni | Branch Post Office |
| 636 | Koraharbans | Bhulli BO | 📍 843325 | Parsauni | Branch Post Office |
| 637 | Koriahi | Jadupatti Bazar BO | 📍 843319 | Charaut | Branch Post Office |
| 638 | Koriahi urf Kalyanpatti | Koryahi BO | 📍 843319 | Sursand | Branch Post Office |
| 639 | Korlahi Haranarayan | Korlahia Mansingh BO | 📍 843117 | Runisaidpur | Branch Post Office |
| 640 | Korlahi Mansingh | Korlahia Mansingh BO | 📍 843117 | Runisaidpur | Branch Post Office |
| 641 | Kothia Belahi Nilkanth | Athri SO | 📍 843311 | Runisaidpur | Post Office - PO |
| 642 | Kothia Belahi Nilkanth | Belahi BO | 📍 843311 | Runisaidpur | Branch Post Office |
| 643 | Kothia Belahi Nilkanth | Runnisaidpur SO | 📍 843328 | Runisaidpur | Post Office - PO |
| 644 | Kothia Rae | D. Kala BO | 📍 843315 | Suppi | Post Office - PO |
| 645 | Kothiar | Barharwa SO Sitamarhi | 📍 843315 | Suppi | Post Office - PO |
| 646 | Kothiar | Bokhtha BO | 📍 843315 | Suppi | Branch Post Office |
| 647 | Kothiar | Madhurapur BO | 📍 843315 | Suppi | Branch Post Office |
| 648 | Kuahi | G.Pitaunjhia BO | 📍 843116 | Runisaidpur | Branch Post Office |
| 649 | Kuahi | Bhanaspatti BO | 📍 843328 | Runisaidpur | Branch Post Office |
| 650 | Kuari | Jogiwana BO | 📍 843322 | Bathnaha | Branch Post Office |