| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 601 | Jhuni Istamrar | Belarikbaganj BO | 📍 854304 | Krityanand Nagar | Branch Post Office |
| 602 | Jiagachhi | Bhogabhatgama BO | 📍 854337 | Purnia East | Branch Post Office |
| 603 | Jianganj | Zianganj BO | 📍 854306 | Banmankhi | Branch Post Office |
| 604 | Jianganj Milik | Sarsi SO | 📍 854306 | Banmankhi | Post Office - PO |
| 605 | Jinhaur | Baisi SO | 📍 854315 | Baisa | Post Office - PO |
| 606 | Jogaili | Jageli BO | 📍 854304 | Srinagar | Branch Post Office |
| 607 | Joginia | Shishabari BO | 📍 855115 | Baisa | Branch Post Office |
| 608 | Junhari | Jalalgarh SO | 📍 854327 | Jalalgarh | Post Office - PO |
| 609 | K Bagh hat | Khuskibagh SO | 📍 854305 | Purnia East | Post Office - PO |
| 610 | K P Market | Purnea Polyticnic SO | 📍 854303 | Purnia East | Post Office - PO |
| 611 | Kabaia | Baigna BO | 📍 855101 | Baisa | Branch Post Office |
| 612 | Kabir Tola | Bhawanipur Rajdham SO | 📍 854204 | Bhawanipur | Post Office - PO |
| 613 | Kachna | Mahalbari BO | 📍 854326 | Dagarua | Branch Post Office |
| 614 | Kachna | Kishanganj SO | 📍 855107 | Baisa | Post Office - PO |
| 615 | Kadamgachhi | Dagarua Hat BO | 📍 854326 | Dagarua | Branch Post Office |
| 616 | Kadgaon | Bishanpur BO | 📍 854315 | Amour | Branch Post Office |
| 617 | Kadgawan | Jageli BO | 📍 854304 | Srinagar | Branch Post Office |
| 618 | Kadwa | Majgama BO | 📍 854330 | Kasba | Branch Post Office |
| 619 | Kadwadangi | Bhogabhatgama BO | 📍 854337 | Purnia East | Branch Post Office |
| 620 | Kajal | Baisi SO | 📍 854315 | Baisi | Post Office - PO |
| 621 | Kajha | Kajha BO | 📍 854304 | Krityanand Nagar | Branch Post Office |
| 622 | Kajra | Rangpura BO | 📍 854304 | Dhamdaha | Branch Post Office |
| 623 | Kala Balua | Kala Balua BO | 📍 854201 | Krityanand Nagar | Branch Post Office |
| 624 | Kala Ghat | Ranipatra SO | 📍 854337 | Purnia East | Post Office - PO |
| 625 | Kali Bri Chowk | Purnea City SO | 📍 854302 | Purnia East | Post Office - PO |
| 626 | Kalsarkismat | Bhogabhatgama BO | 📍 854337 | Purnia East | Branch Post Office |
| 627 | Kalthia | Mirpur BO | 📍 855115 | Baisa | Branch Post Office |
| 628 | Kamal Pur | Ranipatra SO | 📍 854337 | Purnia East | Post Office - PO |
| 629 | Kamalpur | Kamalpur BO | 📍 854203 | Barhara | Branch Post Office |
| 630 | Kamalpur | Mathour BO | 📍 854330 | Kasba | Branch Post Office |
| 631 | Kamalpur | Bhogabhatgama BO | 📍 854337 | Dagarua | Branch Post Office |
| 632 | kamalpur Jagir | Kamalpur BO | 📍 854203 | Barhara | Branch Post Office |
| 633 | Kamalpur Milik | Kamalpur BO | 📍 854203 | Barhara | Branch Post Office |
| 634 | Kamargaon | Baisi SO | 📍 854315 | Baisi | Post Office - PO |
| 635 | Kamraili | Mathour BO | 📍 854330 | Kasba | Branch Post Office |
| 636 | Kamraili | Bhogabhatgama BO | 📍 854337 | Purnia East | Branch Post Office |
| 637 | Kanharia | Kanharia BO | 📍 854315 | Dagarua | Branch Post Office |
| 638 | Kanharia | Machhatta BO | 📍 854315 | Amour | Branch Post Office |
| 639 | Kanhaur | Kishanganj SO | 📍 855107 | Baisa | Post Office - PO |
| 640 | Kanimaldahi | Runki BO | 📍 855107 | Baisa | Branch Post Office |
| 641 | Kankhudia | Jalalgarh SO | 📍 854327 | Jalalgarh | Post Office - PO |
| 642 | Kanp | Balla BO | 📍 854204 | Rupauli | Branch Post Office |
| 643 | Kanphulia | Asja BO | 📍 855107 | Baisa | Branch Post Office |
| 644 | Kanwapara | Kulla Kahs BO | 📍 854330 | Kasba | Branch Post Office |
| 645 | Kaparia Bangaon | Talbari BO | 📍 854315 | Amour | Branch Post Office |
| 646 | Kaptanpara | Khuskibagh SO | 📍 854305 | Purnia East | Post Office - PO |
| 647 | Karia | Kheria BO | 📍 854108 | Amour | Branch Post Office |
| 648 | Karimnagar Jhuni Milik | Garhiyabalua BO | 📍 854304 | Srinagar | Branch Post Office |
| 649 | Karimnagar Jhuni Milik | Belarikbaganj BO | 📍 854304 | Krityanand Nagar | Branch Post Office |
| 650 | Kasba | Bahora BO | 📍 854306 | Kasba | Branch Post Office |