| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 601 | Karimpur | Sanjh BO | 📍 813105 | Rajaun | Branch Post Office |
| 602 | Karma | Bindi BO | 📍 813109 | Banka | Branch Post Office |
| 603 | Karsanda | Palaria BO | 📍 813211 | Shambhuganj | Branch Post Office |
| 604 | Karsandi | Palaria BO | 📍 813211 | Shambhuganj | Branch Post Office |
| 605 | Karsop | Shambhuganj SO | 📍 813211 | Shambhuganj | Post Office - PO |
| 606 | Karsop Arazi | Shambhuganj SO | 📍 813211 | Shambhuganj | Post Office - PO |
| 607 | Karuwa Pathal | Kandnar BO | 📍 813101 | Belhar | Branch Post Office |
| 608 | Karuwa Pathal | Darha BO | 📍 813212 | Belhar | Branch Post Office |
| 609 | Kasba | Hasai BO | 📍 813205 | Dhuraiya | Branch Post Office |
| 610 | Kasba | Kasba BO | 📍 813211 | Shambhuganj | Branch Post Office |
| 611 | Kasba Mandar | Mandar Vidyapith BO | 📍 813104 | Bausi | Branch Post Office |
| 612 | Kashidih | Beldiha BO | 📍 813207 | Belhar | Branch Post Office |
| 613 | Kashidih | Shambhuganj SO | 📍 813211 | Shambhuganj | Post Office - PO |
| 614 | Kashidih | Kavisha BO | 📍 813211 | Shambhuganj | Branch Post Office |
| 615 | Kashidih | Chathar Dhaniar BO | 📍 813221 | Shambhuganj | Branch Post Office |
| 616 | Kasoi | Bhorsar BO | 📍 814131 | Chanan | Branch Post Office |
| 617 | Kaspur | Kushmaha BO | 📍 813104 | Amarpur | Branch Post Office |
| 618 | Kaspur Arazi | Gorgama BO | 📍 813104 | Amarpur | Branch Post Office |
| 619 | Kasraha | Karanjha BO | 📍 813207 | Shambhuganj | Branch Post Office |
| 620 | Katahara | Hasai BO | 📍 813205 | Dhuraiya | Branch Post Office |
| 621 | Kataun | Shambhuganj SO | 📍 813211 | Chanan | Post Office - PO |
| 622 | Kath Bangaon | Mangachak BO | 📍 813205 | Dhuraiya | Branch Post Office |
| 623 | Kath Chatur | Rajwara BO | 📍 813101 | Rajaun | Branch Post Office |
| 624 | Kathail | Kathail BO | 📍 813101 | Amarpur | Branch Post Office |
| 625 | Kathaum | Katoria SO | 📍 813106 | Katoria | Post Office - PO |
| 626 | Kathauni | Bishanpur BO | 📍 813205 | Dhuraiya | Branch Post Office |
| 627 | Kathrang | Kathrang BO | 📍 813105 | Rajaun | Branch Post Office |
| 628 | Kathrang | Gopalpur BO | 📍 813107 | Rajaun | Branch Post Office |
| 629 | Kathwan | Kathoun BO | 📍 813107 | Rajaun | Branch Post Office |
| 630 | Katia | Punsia SO | 📍 813109 | Rajaun | Post Office - PO |
| 631 | Katiawan | Rajoun SO | 📍 813107 | Rajaun | Post Office - PO |
| 632 | Katoria | Katoria SO | 📍 813106 | Katoria | Post Office - PO |
| 633 | Kauabari | Sighnan BO | 📍 813105 | Rajaun | Branch Post Office |
| 634 | Kauadah | Bhorsar BO | 📍 814131 | Chanan | Branch Post Office |
| 635 | Kawari | Rajoun SO | 📍 813107 | Rajaun | Post Office - PO |
| 636 | Keamdi Chak | Maikaita BO | 📍 813105 | Dhuraiya | Branch Post Office |
| 637 | Kendua Jharna | Mathura Sahibganj BO | 📍 813202 | Belhar | Branch Post Office |
| 638 | Kenli | Shambhuganj SO | 📍 813211 | Shambhuganj | Post Office - PO |
| 639 | Kerwar | Mathura Sahibganj BO | 📍 813202 | Belhar | Branch Post Office |
| 640 | Keshopur | Shambhuganj SO | 📍 813211 | Shambhuganj | Post Office - PO |
| 641 | Keuchi | Hasai BO | 📍 813205 | Dhuraiya | Branch Post Office |
| 642 | Kewari | Kolhatha BO | 📍 813109 | Barahat | Branch Post Office |
| 643 | Khadimpur | Rajoun SO | 📍 813107 | Rajaun | Post Office - PO |
| 644 | Khagra | Batsar BO | 📍 813205 | Dhuraiya | Branch Post Office |
| 645 | Khaira | Ranghatta BO | 📍 813102 | Rajaun | Head Post Office - H |
| 646 | Khaira | Katoria SO | 📍 813106 | Amarpur | Post Office - PO |
| 647 | Khaira | Batsar BO | 📍 813205 | Dhuraiya | Branch Post Office |
| 648 | Khajur Koraman | Rajoun SO | 📍 813107 | Rajaun | Post Office - PO |
| 649 | Khajuri | Shambhuganj SO | 📍 813211 | Shambhuganj | Post Office - PO |
| 650 | Khajuri Milik | Shambhuganj SO | 📍 813211 | Shambhuganj | Post Office - PO |