| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 651 | Kasba | Kasba SO Purnia | 📍 854330 | Kasba | Post Office - PO |
| 652 | Kashipur | Tarauna BO | 📍 854327 | Amour | Branch Post Office |
| 653 | Kasibari | Kansibarihat BO | 📍 855107 | Baisa | Branch Post Office |
| 654 | Kasiran Deotar | Deotar BO | 📍 854202 | Banmankhi | Branch Post Office |
| 655 | kataha | Banaili SO | 📍 854201 | Krityanand Nagar | Post Office - PO |
| 656 | Kataili | Jalalgarh SO | 📍 854327 | Jalalgarh | Post Office - PO |
| 657 | Katari | Kanharia BO | 📍 854315 | Dagarua | Branch Post Office |
| 658 | Kathaul | Baisi SO | 📍 854315 | Baisi | Post Office - PO |
| 659 | Kathaul Milik | Baisi SO | 📍 854315 | Baisi | Post Office - PO |
| 660 | Kathua | Bhogabhatgama BO | 📍 854337 | Purnia East | Branch Post Office |
| 661 | Kauakol | Baisi SO | 📍 854315 | Baisi | Post Office - PO |
| 662 | Kauanagar | Baisi SO | 📍 854315 | Baisi | Post Office - PO |
| 663 | Kaujia | Angarhat BO | 📍 855115 | Baisa | Branch Post Office |
| 664 | Kavaia | Harda BO | 📍 854303 | Purnia East | Branch Post Office |
| 665 | Kazi Hirdenagar | Kajhi BO | 📍 854202 | Banmankhi | Branch Post Office |
| 666 | Kechua | Mahalbari BO | 📍 854326 | Dagarua | Branch Post Office |
| 667 | Khagaura | Kishanganj SO | 📍 855107 | Baisa | Post Office - PO |
| 668 | Khagjana | Kharaiya BO | 📍 854315 | Amour | Branch Post Office |
| 669 | Khagjana | Majgama BO | 📍 854330 | Kasba | Branch Post Office |
| 670 | Khagjana | Mirpur BO | 📍 855115 | Baisa | Branch Post Office |
| 671 | Khagri Tola | Purnea Chowk SO | 📍 854304 | Purnia East | Post Office - PO |
| 672 | Khagurail | Durgapur BO | 📍 854113 | Bhawanipur | Branch Post Office |
| 673 | Khajura Patti | Madhonagar BO | 📍 854204 | Bhawanipur | Branch Post Office |
| 674 | Khalsa Arazi | Rupauli BO | 📍 854204 | Rupauli | Branch Post Office |
| 675 | Khalwara | Jalalgarh SO | 📍 854327 | Jalalgarh | Post Office - PO |
| 676 | Khamela | Bara Ishambara BO | 📍 854329 | Amour | Branch Post Office |
| 677 | Khanua | B.K.Asthan BO | 📍 854303 | Dhamdaha | Branch Post Office |
| 678 | Khapara | Asja Mobaiya BO | 📍 854315 | Baisi | Branch Post Office |
| 679 | Khapra | Kishanganj SO | 📍 855107 | Baisa | Post Office - PO |
| 680 | Kharhi | Hafania BO | 📍 854315 | Baisi | Branch Post Office |
| 681 | Khari | Baisi SO | 📍 854315 | Amour | Post Office - PO |
| 682 | khariya | Kharaiya BO | 📍 854315 | Amour | Branch Post Office |
| 683 | Kharkatta | Bahdura BO | 📍 854204 | Bhawanipur | Branch Post Office |
| 684 | Kharsota | Kharsouta BO | 📍 855113 | Baisi | Branch Post Office |
| 685 | Khazanchi Hat | Raghunathpur BO | 📍 854204 | Purnia East | Branch Post Office |
| 686 | Khemchand | Khemchand BO | 📍 854304 | Krityanand Nagar | Branch Post Office |
| 687 | Khemia | Amour BO | 📍 854315 | Amour | Branch Post Office |
| 688 | Khikhirmania | Mahalbari BO | 📍 854326 | Dagarua | Branch Post Office |
| 689 | Khokha | Khokha BO | 📍 854304 | Srinagar | Branch Post Office |
| 690 | Khoksa | Khoksa BO | 📍 854315 | Baisi | Branch Post Office |
| 691 | Khuda Rupaspur | Khudna Rupaspur BO | 📍 854303 | Purnia East | Branch Post Office |
| 692 | Khunkhuni | Jhawari BO | 📍 854330 | Amour | Branch Post Office |
| 693 | Khunt | Chopra Ram Nagar SO | 📍 854102 | Banmankhi | Post Office - PO |
| 694 | Khunti Dhanaili | Srinagar BO | 📍 854304 | Srinagar | Branch Post Office |
| 695 | Khunti Dhanaili Uria Bhag | Srinagar BO | 📍 854304 | Srinagar | Branch Post Office |
| 696 | Khunti Hasaili | Srinagar BO | 📍 854304 | Srinagar | Branch Post Office |
| 697 | Khushalpur | Chandidoria BO | 📍 854315 | Baisa | Branch Post Office |
| 698 | Khuskibagh | Khuskibagh SO | 📍 854305 | Purnia East | Post Office - PO |
| 699 | Khutia | Khoksa BO | 📍 854315 | Baisi | Branch Post Office |
| 700 | Kilpara Kalan | Dhusmalhat BO | 📍 855107 | Baisa | Branch Post Office |