| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 701 | Jharmahui | Jharmahuee BO | 📍 845103 | Ramnagar | Branch Post Office |
| 702 | Jhumka | Behra BO | 📍 845307 | Mainatanr | Branch Post Office |
| 703 | Jigna | Chauhatta BO | 📍 845451 | Mainatanr | Branch Post Office |
| 704 | Jina Chap | Jado Chhapar BO | 📍 845450 | Chanpatia | Branch Post Office |
| 705 | Jinwalia | Sirisia BO | 📍 845450 | Chanpatia | Branch Post Office |
| 706 | Jiria | Lakhanpur BO | 📍 845453 | Lauriya | Branch Post Office |
| 707 | Jobdi | Ghorpakari BO | 📍 845306 | Mainatanr | Branch Post Office |
| 708 | Jogapatti | Jogapatti SO | 📍 845452 | Jogapatti | Post Office - PO |
| 709 | Jogia | Harinagar SO | 📍 845103 | Ramnagar | Post Office - PO |
| 710 | Jogia | Jogia BO | 📍 845103 | Ramnagar | Branch Post Office |
| 711 | Jura | Taruanwa BO | 📍 845105 | Bagaha | Branch Post Office |
| 712 | K Bhelahi | Naraipur SO | 📍 845105 | Bagaha | Post Office - PO |
| 713 | Kachkahar | Jamunia BO | 📍 845455 | Gaunaha | Branch Post Office |
| 714 | Kadamha | Cheutaha BO | 📍 845106 | Sidhaw | Branch Post Office |
| 715 | Kaimabandh | Rajwatia BO | 📍 845101 | Bagaha | Branch Post Office |
| 716 | Kairi | Gaunaha SO | 📍 845102 | Gaunaha | Branch Post Office |
| 717 | Kalibagh | Bettiah HO | 📍 845438 | Bettiah | Head Post Office - H |
| 718 | Kamalnath Nagar | Bettiah HO | 📍 845438 | Bettiah | Head Post Office - H |
| 719 | Kamta | Padraun BO | 📍 845451 | Gaunaha | Branch Post Office |
| 720 | Kandholia | Baswariya BO | 📍 845453 | Lauriya | Branch Post Office |
| 721 | Kanghusri | Meghwal Mathia BO | 📍 845106 | Ramnagar | Branch Post Office |
| 722 | Kangli | Mathia Kathia BO | 📍 845307 | Sikta | Branch Post Office |
| 723 | Kanhaiyapur | Manpur BO | 📍 845101 | Bhitaha | Branch Post Office |
| 724 | Karampatti | Pokharia Rai BO | 📍 845449 | Chanpatia | Branch Post Office |
| 725 | Karamtola | Bakharia BO | 📍 845454 | Majhaulia | Branch Post Office |
| 726 | Karamwa | Gora Karamwa BO | 📍 845454 | Majhaulia | Branch Post Office |
| 727 | Karamwa | Rajabhar BO | 📍 845454 | Majhaulia | Branch Post Office |
| 728 | Kargahia Purab | Bettiah RS SO | 📍 845438 | Bettiah | Post Office - PO |
| 729 | Kargahiya pachhim | Bettiah RS SO | 📍 845438 | Bettiah | Post Office - PO |
| 730 | Karhia Basauli | Manpur BO | 📍 845101 | Bhitaha | Branch Post Office |
| 731 | Karjania | Baswariya BO | 📍 845453 | Bagaha | Branch Post Office |
| 732 | Karmaha | Tinferia BO | 📍 845105 | Sidhaw | Branch Post Office |
| 733 | Karmaha | Serwa Done BO | 📍 845106 | Ramnagar | Branch Post Office |
| 734 | Kataha | Gaunaha SO | 📍 845102 | Gaunaha | Branch Post Office |
| 735 | Kataha | Kathar BO | 📍 845104 | Madhubani | Branch Post Office |
| 736 | Kataha | Khaira Tola BO | 📍 845104 | Madhubani | Branch Post Office |
| 737 | Kataha | Semra Medraul BO | 📍 845105 | Sidhaw | Branch Post Office |
| 738 | Kataha | Serwa Done BO | 📍 845106 | Ramnagar | Branch Post Office |
| 739 | Katahia | Kathaia BO | 📍 845454 | Majhaulia | Branch Post Office |
| 740 | Katahri | Sathi BO | 📍 845449 | Narkatiaganj | Branch Post Office |
| 741 | Kataia | Siswania BO | 📍 845453 | Lauriya | Branch Post Office |
| 742 | Kathar | Madhubani SO | 📍 845104 | Thakrahan | Post Office - PO |
| 743 | Katharwa | Harnatar BO | 📍 845105 | Sidhaw | Branch Post Office |
| 744 | Kathraw | Jamunia BO | 📍 845455 | Gaunaha | Branch Post Office |
| 745 | Katkuina | Tarwalia BO | 📍 845105 | Sidhaw | Branch Post Office |
| 746 | Katphorwa | Rampurwa BO | 📍 845105 | Sidhaw | Branch Post Office |
| 747 | Katsikri | Meghwal Mathia BO | 📍 845106 | Ramnagar | Branch Post Office |
| 748 | Kauaha | Jamunia BO | 📍 845455 | Gaunaha | Branch Post Office |
| 749 | Kaubar | Manpur BO | 📍 845101 | Bhitaha | Branch Post Office |
| 750 | Kaulachi | Sabeya BO | 📍 845103 | Ramnagar | Branch Post Office |