| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 801 | Khodaganj | Belbari BO | 📍 855113 | Azamnagar | Branch Post Office |
| 802 | Khodna | Korha SO | 📍 854108 | Korha | Post Office - PO |
| 803 | Khojate Hat | Kehunia BO | 📍 854116 | Pranpur | Branch Post Office |
| 804 | Khonta | Sameli BO | 📍 854101 | Sameli | Branch Post Office |
| 805 | Khonta Milik | Dumar BO | 📍 854104 | Sameli | Branch Post Office |
| 806 | Khopra | Belbari BO | 📍 855113 | Azamnagar | Branch Post Office |
| 807 | Khorwa | Dalan BO | 📍 854106 | katihar | Branch Post Office |
| 808 | Khotapara | Chandpur BO | 📍 855105 | Kadwa | Branch Post Office |
| 809 | Khuriyal | Azamnagar BO | 📍 855113 | Azamnagar | Branch Post Office |
| 810 | Khusalpur | Kehunia BO | 📍 854116 | Pranpur | Branch Post Office |
| 811 | Khusalpur | Chandpur BO | 📍 855105 | Kadwa | Branch Post Office |
| 812 | Khutapara | Sadapur BO | 📍 855113 | Kadwa | Branch Post Office |
| 813 | Kirora | Kirora BO | 📍 854317 | Balrampur | Branch Post Office |
| 814 | Kirora Milik | Kirora BO | 📍 854317 | Balrampur | Branch Post Office |
| 815 | Kishorganj | Marwa BO | 📍 854104 | Korha | Branch Post Office |
| 816 | Kishunbhati | Fatehpur BO | 📍 855101 | Balrampur | Branch Post Office |
| 817 | Kishunpur | Hemkunj BO | 📍 854113 | Amdabad | Branch Post Office |
| 818 | Kishunpur | Manihari SO | 📍 854113 | Manihari | Post Office - PO |
| 819 | Kismat Bari | Telta BO | 📍 854317 | Balrampur | Branch Post Office |
| 820 | Kismat Mirzadpur | Madarichak BO | 📍 854113 | Manihari | Branch Post Office |
| 821 | Kodhaul | Salmari SO | 📍 855113 | Azamnagar | Post Office - PO |
| 822 | Kohbara | Pothia SO | 📍 854114 | Falka | Post Office - PO |
| 823 | Kohrabari | Sitalmani BO | 📍 855102 | Azamnagar | Branch Post Office |
| 824 | Koia | Kharsouta BO | 📍 855113 | Azamnagar | Branch Post Office |
| 825 | Kolgawan | Gurubazar SO | 📍 854104 | Barari | Post Office - PO |
| 826 | Kolha | Sudhani RS BO | 📍 854317 | Barsoi | Branch Post Office |
| 827 | Kolha | Chowki Haripur BO | 📍 855105 | Kadwa | Branch Post Office |
| 828 | Kolha Badaur | Sudhani RS BO | 📍 854317 | Barsoi | Branch Post Office |
| 829 | Kolhan | Kharsouta BO | 📍 855113 | Azamnagar | Branch Post Office |
| 830 | Korgawan | Hasanganj BO | 📍 854337 | Hasanganj | Branch Post Office |
| 831 | Korha | Korha SO | 📍 854108 | Korha | Post Office - PO |
| 832 | Kota | Balupara BO | 📍 854317 | Barsoi | Branch Post Office |
| 833 | Kotara | Salmari SO | 📍 855113 | Barsoi | Post Office - PO |
| 834 | Kotebador | Telta BO | 📍 854317 | Balrampur | Branch Post Office |
| 835 | Kothar | Sankola BO | 📍 855102 | Barsoi | Branch Post Office |
| 836 | Krishna Nagar | Katihar Bmp Camp SO | 📍 854106 | katihar | Post Office - PO |
| 837 | Krishna puri | Katihar Bmp Camp SO | 📍 854106 | katihar | Post Office - PO |
| 838 | Kuchaili | Durgaganj SO | 📍 855105 | Kadwa | Post Office - PO |
| 839 | Kuchiahi Milik | Sujapur BO | 📍 854115 | Barari | Branch Post Office |
| 840 | Kuchiamor | Bighor BO | 📍 854317 | Barsoi | Branch Post Office |
| 841 | Kuchpokhar | Balupara BO | 📍 854317 | Barsoi | Branch Post Office |
| 842 | Kumar Khad | Pirmokam BO | 📍 854114 | Falka | Branch Post Office |
| 843 | Kumaripur | Daharia Molls SO | 📍 854103 | Manihari | Post Office - PO |
| 844 | Kumaripur | Kumaripur BO | 📍 854103 | katihar | Branch Post Office |
| 845 | Kumhari Harijan Tola | Durgaganj SO | 📍 855105 | katihar | Post Office - PO |
| 846 | Kumhra | Khudna Rupaspur BO | 📍 854303 | Korha | Branch Post Office |
| 847 | Kunhari | Durgaganj SO | 📍 855105 | Kadwa | Post Office - PO |
| 848 | Kuraitha | Katihar Mill SO | 📍 854107 | Mansahi | Post Office - PO |
| 849 | Kuretha Panchayat Bhawan | Kuretha' BO | 📍 854107 | katihar | Branch Post Office |
| 850 | Kurhaila | Salmari SO | 📍 855113 | Kadwa | Post Office - PO |