| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 651 | Khatiwa | Atrauna BO | 📍 802123 | Itarhi | Branch Post Office |
| 652 | Khekhsi | Mahila BO | 📍 802123 | Itarhi | Branch Post Office |
| 653 | Khelafatpur | Chausa SO Buxar | 📍 802114 | Chausa | Post Office - PO |
| 654 | Khempur | Moharihan BO | 📍 802128 | Rajpur | Branch Post Office |
| 655 | Khemrajpur | Chausa SO Buxar | 📍 802114 | Chausa | Post Office - PO |
| 656 | Khemrajpur | Khiri BO | 📍 802128 | Rajpur | Branch Post Office |
| 657 | Kherhi | Chaugain BO | 📍 802205 | Chaugain | Branch Post Office |
| 658 | Khewali | Amsari BO | 📍 802126 | Chaugain | Branch Post Office |
| 659 | Khilla | Mangraon Sangraon BO | 📍 802122 | Rajpur | Branch Post Office |
| 660 | Khiri | Khiri BO | 📍 802128 | Rajpur | Branch Post Office |
| 661 | Khochariyawan | Nachap BO | 📍 802134 | Barhampur | Branch Post Office |
| 662 | Khochrihan | Chaubey Ke Prasia BO | 📍 802128 | Rajpur | Branch Post Office |
| 663 | Khoraitha | Itarhian BO | 📍 802117 | Rajpur | Branch Post Office |
| 664 | Khorampur | Sikraul BO | 📍 802129 | Chausa | Branch Post Office |
| 665 | Khutaha | Majharia BO | 📍 802116 | Buxar | Branch Post Office |
| 666 | Kiratpura | Kamarpur BO | 📍 802102 | Buxar | Branch Post Office |
| 667 | Kirni | Katiknar BO | 📍 802125 | Kesath | Branch Post Office |
| 668 | Kisagar | Jogia BO | 📍 802111 | Barhampur | Branch Post Office |
| 669 | Kishunipur | Hethua BO | 📍 802122 | Rajpur | Branch Post Office |
| 670 | Kishunipur | Jalahara BO | 📍 802128 | Rajpur | Branch Post Office |
| 671 | Kocharhi | Sikraul BO | 📍 802129 | Chausa | Branch Post Office |
| 672 | Kodai | Bhadwar Barari BO | 📍 802134 | Barhampur | Branch Post Office |
| 673 | Koliya | Keshopur BO | 📍 802113 | Simri | Branch Post Office |
| 674 | Konauli | Jalahara BO | 📍 802128 | Rajpur | Branch Post Office |
| 675 | Konch | Unwas BO | 📍 802123 | Itarhi | Branch Post Office |
| 676 | konia | Banarpur BO | 📍 802114 | Chausa | Branch Post Office |
| 677 | Kopwa | Kopawan BO | 📍 802126 | Dumraon | Branch Post Office |
| 678 | Korarawa | Karhshi BO | 📍 802102 | Buxar | Branch Post Office |
| 679 | Kot Ditto | Keshopur BO | 📍 802113 | Simri | Branch Post Office |
| 680 | Kothia | Sonbarsa BO | 📍 802118 | Buxar | Branch Post Office |
| 681 | Kuawan | Kaithi BO | 📍 802134 | Barhampur | Branch Post Office |
| 682 | Kudratipur | Karhshi BO | 📍 802102 | Buxar | Branch Post Office |
| 683 | Kudria | Nenua BO | 📍 802119 | Dumraon | Branch Post Office |
| 684 | Kukur Bhuka | Bhatauli BO | 📍 802129 | Nawanagar | Branch Post Office |
| 685 | Kukurha | Kukurahan BO | 📍 802123 | Itarhi | Branch Post Office |
| 686 | Kulhariya | Nadaoan BO | 📍 802103 | Buxar | Branch Post Office |
| 687 | Kulhawa | Barki Basauri BO | 📍 802119 | Dumraon | Branch Post Office |
| 688 | Kulmanpur | Sheopur North BO | 📍 802125 | Kesath | Branch Post Office |
| 689 | Kumbhi | Purana Bhojpur SO | 📍 802133 | Dumraon | Post Office - PO |
| 690 | Kunjnara | Belaon BO | 📍 802129 | Nawanagar | Branch Post Office |
| 691 | Kunriya | Nenua BO | 📍 802119 | Dumraon | Branch Post Office |
| 692 | Kunrwa | Kakaria BO | 📍 802117 | Rajpur | Branch Post Office |
| 693 | Kuransarae | Belahari BO | 📍 802126 | Dumraon | Branch Post Office |
| 694 | Kuransarae | Kanjharua BO | 📍 802126 | Dumraon | Branch Post Office |
| 695 | Kuransarae | Kasia BO | 📍 802126 | Dumraon | Branch Post Office |
| 696 | Kuransarae | Khandricha BO | 📍 802126 | Dumraon | Branch Post Office |
| 697 | Kuransarae | Koran Sarai SO | 📍 802126 | Dumraon | Post Office - PO |
| 698 | Kurthiya | Baruhan BO | 📍 802134 | Barhampur | Branch Post Office |
| 699 | Kusahara | Keshopur BO | 📍 802113 | Simri | Branch Post Office |
| 700 | Kusahi | Akhauripur Gola BO | 📍 802114 | Chausa | Branch Post Office |