| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 401 | Kamalpur | Hansa BO | 📍 854312 | Raniganj | Branch Post Office |
| 402 | Kamalpur | Pachira BO | 📍 854334 | Raniganj | Branch Post Office |
| 403 | Kamat Pathraha | Ghurna BO | 📍 854336 | Narpatganj | Branch Post Office |
| 404 | kamatsatbita | Araria Bairgachhi BO | 📍 854311 | Araria | Branch Post Office |
| 405 | Kamladorha | Kursakanta SO | 📍 854331 | Kursakatta | Post Office - PO |
| 406 | Kandhaili | Kannaili BO | 📍 854318 | Narpatganj | Branch Post Office |
| 407 | Kankhudia | Kankhudia BO | 📍 854333 | Palasi | Branch Post Office |
| 408 | Karahara | Mahalgaon BO | 📍 854325 | Jokihat | Branch Post Office |
| 409 | Karahbari | Bhojpur BO | 📍 854333 | Sikti | Branch Post Office |
| 410 | Karahia | Mirzapur BO | 📍 854312 | Raniganj | Branch Post Office |
| 411 | Karahia | Megra Mehndipur BO | 📍 854331 | Kursakatta | Branch Post Office |
| 412 | Karankia | Karankia BO | 📍 854312 | Raniganj | Branch Post Office |
| 413 | Karhara Chhaprail | Kurshail BO | 📍 854329 | Jokihat | Branch Post Office |
| 414 | Kariat | Jalalgarh SO | 📍 854327 | Jokihat | Post Office - PO |
| 415 | Karor | Kankhudia BO | 📍 854333 | Palasi | Branch Post Office |
| 416 | Karor Deghli | Kankhudia BO | 📍 854333 | Palasi | Branch Post Office |
| 417 | Kasaila Gachh Garha Bhagkasail | Madanpur SO Araria | 📍 854333 | Araria | Post Office - PO |
| 418 | Kashibari | Sonadarhat BO | 📍 854329 | Palasi | Branch Post Office |
| 419 | Kashim Mukhia tola | Bhawanipur BO | 📍 854336 | Narpatganj | Branch Post Office |
| 420 | Kathalbari | Patharbari BO | 📍 854329 | Jokihat | Branch Post Office |
| 421 | Kathora | Bihari BO | 📍 854329 | Palasi | Branch Post Office |
| 422 | Katpahar | Kuari SO | 📍 854332 | Kursakatta | Post Office - PO |
| 423 | Kauakoh | Tarakhandah BO | 📍 854331 | Sikti | Branch Post Office |
| 424 | Kediya Tola | Araria RS SO | 📍 854312 | Araria | Post Office - PO |
| 425 | Kesarra | Kessara BO | 📍 854329 | Jokihat | Branch Post Office |
| 426 | Kessara B O | Kessara BO | 📍 854329 | Jokihat | Branch Post Office |
| 427 | Khagara | Khagra BO | 📍 854335 | Narpatganj | Branch Post Office |
| 428 | khaira | Khagra BO | 📍 854335 | Narpatganj | Branch Post Office |
| 429 | Khairkhan B O | Khairkhan BO | 📍 854318 | Forbesganj | Branch Post Office |
| 430 | Khajurbari | Megra Mehndipur BO | 📍 854331 | Kursakatta | Branch Post Office |
| 431 | Khajuri | Khajurihat BO | 📍 854334 | Bhargama | Branch Post Office |
| 432 | Khajuri Milik | Khajurihat BO | 📍 854334 | Bhargama | Branch Post Office |
| 433 | Khajurihat | Khajurihat BO | 📍 854334 | Bhargama | Branch Post Office |
| 434 | Khamgara | Jamua BO | 📍 854331 | Araria | Branch Post Office |
| 435 | Khamkol | Amhara BO | 📍 854318 | Forbesganj | Branch Post Office |
| 436 | Khapdeh | Kannaili BO | 📍 854318 | Narpatganj | Branch Post Office |
| 437 | Khapra | Sonadarhat BO | 📍 854329 | Palasi | Branch Post Office |
| 438 | Kharhar | Madanpur SO Araria | 📍 854333 | Araria | Post Office - PO |
| 439 | Kharhat | Gidwas BO | 📍 854312 | Raniganj | Branch Post Office |
| 440 | Kharsahi | Gidwas BO | 📍 854312 | Raniganj | Branch Post Office |
| 441 | Khawaspur | Khawashpur BO | 📍 854318 | Forbesganj | Branch Post Office |
| 442 | khesrail | Kursakanta SO | 📍 854331 | Kursakatta | Post Office - PO |
| 443 | Khirdaha | Jokihat SO | 📍 854329 | Jokihat | Post Office - PO |
| 444 | Khoragachhi | Pararia BO | 📍 854333 | Sikti | Branch Post Office |
| 445 | Khoragachhi Milik | Pararia BO | 📍 854333 | Sikti | Branch Post Office |
| 446 | Khutha Baijnath | K Baijnathpur BO | 📍 854334 | Bhargama | Branch Post Office |
| 447 | Khuthara Mashragi | Amgachhi BO | 📍 854332 | Sikti | Branch Post Office |
| 448 | Khuthura Magrabi | Kursakanta SO | 📍 854331 | Kursakatta | Post Office - PO |
| 449 | Khuti Kharia | Bara Ishambara BO | 📍 854329 | Jokihat | Branch Post Office |
| 450 | Khutti | Jahanpur BO | 📍 854329 | Palasi | Branch Post Office |