| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 601 | Katalpur | Sikraul BO | 📍 802129 | Nawanagar | Branch Post Office |
| 602 | Kataria | Kakaria BO | 📍 802117 | Rajpur | Branch Post Office |
| 603 | Kathaja | Nagpur BO | 📍 802122 | Rajpur | Branch Post Office |
| 604 | Kathar | Kathar BO | 📍 802111 | Simri | Branch Post Office |
| 605 | Katharai | Manikpur BO | 📍 802128 | Rajpur | Branch Post Office |
| 606 | Kathgharwa | Chausa SO Buxar | 📍 802114 | Chausa | Post Office - PO |
| 607 | Kathia | Bhadwar Barari BO | 📍 802134 | Barhampur | Branch Post Office |
| 608 | Kathrai | Dhansoi SO | 📍 802117 | Rajpur | Post Office - PO |
| 609 | Kathtar | Sikraul BO | 📍 802129 | Chausa | Branch Post Office |
| 610 | Katkaulia | Ahirauli BO | 📍 802116 | Buxar | Branch Post Office |
| 611 | Katkinar | Katiknar BO | 📍 802125 | Kesath | Branch Post Office |
| 612 | Kauresar | Nehalpur BO | 📍 802117 | Itarhi | Branch Post Office |
| 613 | Kauresari | Basaon Kalan BO | 📍 802129 | Itarhi | Branch Post Office |
| 614 | Kawalpokhar | Mahila BO | 📍 802123 | Itarhi | Branch Post Office |
| 615 | Kazi Dehri | Nawanagar SO Buxar | 📍 802129 | Nawanagar | Post Office - PO |
| 616 | Kazipur | Dumari SO Buxar | 📍 802120 | Simri | Post Office - PO |
| 617 | Kesath | Chanawath BO | 📍 802125 | Kesath | Branch Post Office |
| 618 | Kesath | Katiknar BO | 📍 802125 | Kesath | Branch Post Office |
| 619 | Kesath | Kesath SO | 📍 802125 | Kesath | Post Office - PO |
| 620 | Kesath | Mania BO | 📍 802125 | Kesath | Branch Post Office |
| 621 | Kesath | Salsala BO | 📍 802125 | Kesath | Branch Post Office |
| 622 | Kesath | Sheopur North BO | 📍 802125 | Kesath | Branch Post Office |
| 623 | Kesath | Sonbarsa BO | 📍 802125 | Kesath | Branch Post Office |
| 624 | Kesath | Waina BO | 📍 802125 | Kesath | Branch Post Office |
| 625 | Keshopur | Keshopur BO | 📍 802113 | Simri | Branch Post Office |
| 626 | KeshopurRajpurDegree Suda Ditto | Keshopur BO | 📍 802113 | Simri | Branch Post Office |
| 627 | Kewatia | Bisikala BO | 📍 802129 | Nawanagar | Branch Post Office |
| 628 | Khadar | Saisar Ganghari BO | 📍 802117 | Rajpur | Branch Post Office |
| 629 | Khadra | Dalsagar BO | 📍 802116 | Buxar | Branch Post Office |
| 630 | Khaira | Dulahpur SO | 📍 802118 | Simri | Post Office - PO |
| 631 | Khaira | Simari SO | 📍 802135 | Simri | Post Office - PO |
| 632 | Khairahi | Attaon BO | 📍 802119 | Dumraon | Branch Post Office |
| 633 | Khakrahi | Sukarwalia BO | 📍 802114 | Itarhi | Branch Post Office |
| 634 | Khandhara | Dulahpur SO | 📍 802118 | Simri | Post Office - PO |
| 635 | Khanpur | Kanehari BO | 📍 802128 | Rajpur | Branch Post Office |
| 636 | Khanpur Mafi | Banni BO | 📍 802128 | Rajpur | Branch Post Office |
| 637 | Khanta | Khanita BO | 📍 802123 | Itarhi | Branch Post Office |
| 638 | Kharagpur | Keshopur BO | 📍 802113 | Simri | Branch Post Office |
| 639 | Kharagpur | Sheopur North BO | 📍 802125 | Kesath | Branch Post Office |
| 640 | Kharagpura | Dehari BO | 📍 802114 | Chausa | Branch Post Office |
| 641 | Kharaicha | Sikraul BO | 📍 802129 | Nawanagar | Branch Post Office |
| 642 | Kharanti | Kamarpur BO | 📍 802102 | Buxar | Branch Post Office |
| 643 | Kharaumiyan | Belaon BO | 📍 802129 | Nawanagar | Branch Post Office |
| 644 | Kharaunia | Kakaria BO | 📍 802117 | Rajpur | Branch Post Office |
| 645 | Kharauniya | Katiknar BO | 📍 802125 | Kesath | Branch Post Office |
| 646 | Kharhana | Kukurahan BO | 📍 802123 | Itarhi | Branch Post Office |
| 647 | Kharhana | Banni BO | 📍 802128 | Rajpur | Branch Post Office |
| 648 | Kharhatanr | Kharahatand BO | 📍 802120 | Simri | Branch Post Office |
| 649 | Kharika | Khiri BO | 📍 802128 | Rajpur | Branch Post Office |
| 650 | Kharka | Sonbarsa BO | 📍 802118 | Buxar | Branch Post Office |