| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 701 | Kadamgachhi | Kadwa BO | 📍 855114 | Kadwa | Branch Post Office |
| 702 | Kadepura | Dalan BO | 📍 854106 | katihar | Branch Post Office |
| 703 | Kadlabari | B.Balrampur BO | 📍 854317 | Balrampur | Branch Post Office |
| 704 | Kadwa | Kadwa BO | 📍 855114 | Kadwa | Branch Post Office |
| 705 | Kadwa | Sonaili SO | 📍 855114 | Kadwa | Post Office - PO |
| 706 | Kadwa Block | Durgaganj SO | 📍 855105 | katihar | Post Office - PO |
| 707 | Kadwa Police Station | Durgaganj SO | 📍 855105 | katihar | Post Office - PO |
| 708 | Kahata | Pranpur BO | 📍 854116 | Pranpur | Branch Post Office |
| 709 | Kajari | Sahja BO | 📍 854107 | Pranpur | Branch Post Office |
| 710 | Kajari | Kalsar BO | 📍 854337 | Hasanganj | Branch Post Office |
| 711 | Kajra | Binjee BO | 📍 854115 | Korha | Branch Post Office |
| 712 | Kakaria | Kadwa BO | 📍 855114 | Kadwa | Branch Post Office |
| 713 | Kalaktari Milik | Chhohar BO | 📍 854114 | Sameli | Branch Post Office |
| 714 | Kalbhitha | Bathna BO | 📍 854317 | Barsoi | Branch Post Office |
| 715 | Kaldehi | Kadwa BO | 📍 855114 | Kadwa | Branch Post Office |
| 716 | Kali Nagar | Bairia BO | 📍 854113 | Amdabad | Branch Post Office |
| 717 | Kaliadangi | Bathna BO | 📍 854317 | Barsoi | Branch Post Office |
| 718 | Kaliannagar | Gunjan BO | 📍 854317 | Barsoi | Branch Post Office |
| 719 | Kalidaspur | Kadwa BO | 📍 855114 | Kadwa | Branch Post Office |
| 720 | Kaliganj | Kadwa BO | 📍 855114 | Kadwa | Branch Post Office |
| 721 | Kalikapur | Semapur Factory SO | 📍 854115 | Barari | Post Office - PO |
| 722 | Kallangaon | B.Balrampur BO | 📍 854317 | Balrampur | Branch Post Office |
| 723 | Kalsar | Kalsar BO | 📍 854337 | Hasanganj | Branch Post Office |
| 724 | Kalsara | Dumaria BO | 📍 855114 | Dandkhora | Branch Post Office |
| 725 | Kamalpur | Salmari SO | 📍 855113 | Azamnagar | Post Office - PO |
| 726 | Kamalpur | Kadwa BO | 📍 855114 | Kadwa | Branch Post Office |
| 727 | Kamalpur Ogaireh | Madarichak BO | 📍 854113 | Manihari | Branch Post Office |
| 728 | Kamat | Mahishal BO | 📍 854317 | Balrampur | Branch Post Office |
| 729 | Kamipur | Pranpur BO | 📍 854116 | Pranpur | Branch Post Office |
| 730 | Kamra | Madhopur BO | 📍 854317 | Balrampur | Branch Post Office |
| 731 | Kamraili | Parveli BO | 📍 855105 | Kadwa | Branch Post Office |
| 732 | Kamraul | Bighor BO | 📍 854317 | Barsoi | Branch Post Office |
| 733 | Kamru | Sonaili SO | 📍 855114 | Kadwa | Post Office - PO |
| 734 | Kanaila | Sudhani RS BO | 📍 854317 | Barsoi | Branch Post Office |
| 735 | Kandhal | Sudhani RS BO | 📍 854317 | Barsoi | Branch Post Office |
| 736 | Kandharpaili | Dawasai BO | 📍 855105 | Dandkhora | Branch Post Office |
| 737 | Kanharia | Azamnagar BO | 📍 855113 | Azamnagar | Branch Post Office |
| 738 | Kanharia Kamat | Azamnagar BO | 📍 855113 | Azamnagar | Branch Post Office |
| 739 | Kansoi | Mahishal BO | 📍 854317 | Balrampur | Branch Post Office |
| 740 | Kant Nagar | Gurubazar SO | 📍 854104 | Barari | Post Office - PO |
| 741 | Kant Nagar | Kant Nagar BO | 📍 854104 | Barari | Branch Post Office |
| 742 | Kanta | Millik Palagarh BO | 📍 855114 | Kadwa | Branch Post Office |
| 743 | Kaparanda | Porla BO | 📍 855102 | Azamnagar | Branch Post Office |
| 744 | Karakol | Salepur BO | 📍 854114 | Falka | Branch Post Office |
| 745 | Karanpur | Fatehpur BO | 📍 855101 | Barsoi | Branch Post Office |
| 746 | Karar Pokhar | Azamnagar BO | 📍 855113 | Azamnagar | Branch Post Office |
| 747 | Karha Milik | Gurubazar SO | 📍 854104 | Barari | Post Office - PO |
| 748 | Karha Milik Sangat | Ayodhyaganj Bazar SO | 📍 854101 | Barari | Post Office - PO |
| 749 | Karimganj | Balupara BO | 📍 854317 | Barsoi | Branch Post Office |
| 750 | Karimullahpur | Chakmaka BO | 📍 854113 | Amdabad | Branch Post Office |