| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 551 | Kaluahi | Narahiya SO | 📍 847108 | Laukahi | Post Office - PO |
| 552 | Kaluahi | Kaluahi SO | 📍 847229 | Kaluahi | Post Office - PO |
| 553 | Kalyanpur | Sarisavpahi SO | 📍 847424 | Pandaul | Post Office - PO |
| 554 | Kamalpur | Dahiwatmadhopur BO | 📍 847234 | Madhubani | Branch Post Office |
| 555 | Kamat Bhawanipur | Bhawanipur BO | 📍 847234 | Madhubani | Branch Post Office |
| 556 | Kamlabari | Lohat SO | 📍 847231 | Pandaul | Post Office - PO |
| 557 | kamlapatpatti | Bishoul BO | 📍 847240 | Harlakhi | Branch Post Office |
| 558 | Kamrahi | Arerhat SO | 📍 847222 | Benipatti | Post Office - PO |
| 559 | Kamtaul | Phulhar BO | 📍 847240 | Harlakhi | Branch Post Office |
| 560 | Kamtaulia | Kumarkhat BO | 📍 847232 | Ladania | Branch Post Office |
| 561 | Kanail | Nazirpur BO | 📍 847215 | Madhubani | Branch Post Office |
| 562 | kanakpur | Narpatinagar BO | 📍 847239 | Pandaul | Branch Post Office |
| 563 | Kanakpura | Chanouraganj BO | 📍 847404 | Jhanjharpur | Branch Post Office |
| 564 | Kanhauli | Kanhauli BO | 📍 847228 | Khajauli | Branch Post Office |
| 565 | Kapar Phora | Madhepur SO | 📍 847408 | Madhepur | Post Office - PO |
| 566 | Kaparia | Karmauli BO | 📍 847229 | Kaluahi | Branch Post Office |
| 567 | Kapasia | Kapsiya BO | 📍 847213 | Benipatti | Branch Post Office |
| 568 | Karahia | Korahiyabalha BO | 📍 847235 | Rajnagar | Branch Post Office |
| 569 | Karahuan | Bengra BO | 📍 847308 | Madhwapur | Branch Post Office |
| 570 | Karhara | Basaith Chandpura SO | 📍 847102 | Benipatti | Post Office - PO |
| 571 | Karhara | Bhagta BO | 📍 847408 | Madhepur | Branch Post Office |
| 572 | Karharwa | Chichorba BO | 📍 847108 | Laukahi | Branch Post Office |
| 573 | Karhi | Karhi BO | 📍 847222 | Benipatti | Branch Post Office |
| 574 | Kariaut | Kariot BO | 📍 847108 | Laukahi | Branch Post Office |
| 575 | karmegh | Karmegh BO | 📍 847421 | Laukaha | Branch Post Office |
| 576 | Karnpur | Mahrail BO | 📍 847404 | Andhratharhi | Branch Post Office |
| 577 | Karpur | Kamrail BO | 📍 847408 | Kaluahi | Branch Post Office |
| 578 | kasera | Dighia Phent BO | 📍 847225 | Harlakhi | Branch Post Office |
| 579 | Kasiam | Lakhnour BO | 📍 847403 | Lakhnaur | Branch Post Office |
| 580 | kasirampatti | Ghoghardiha SO | 📍 847402 | Ghoghardiha | Post Office - PO |
| 581 | Katai | Basuara BO | 📍 847212 | Madhubani | Branch Post Office |
| 582 | Kataia | Kataiya BO | 📍 847223 | Benipatti | Branch Post Office |
| 583 | Kauaha | Birpur BO | 📍 847225 | Basopatti | Branch Post Office |
| 584 | Kauaha pahari | Kauwaha Barhi BO | 📍 847230 | Harlakhi | Branch Post Office |
| 585 | Kaudihar Laukahi | Kariot BO | 📍 847108 | Laukahi | Branch Post Office |
| 586 | Kaurna | Bishoul BO | 📍 847240 | Harlakhi | Branch Post Office |
| 587 | Kaziana | Kaluahi SO | 📍 847229 | Kaluahi | Post Office - PO |
| 588 | Kehunia | Pariharpur BO | 📍 847235 | Rajnagar | Branch Post Office |
| 589 | Keota | Kaluahi SO | 📍 847229 | Kaluahi | Post Office - PO |
| 590 | Kerwar | Kerwar BO | 📍 847222 | Bisfi | Branch Post Office |
| 591 | Keshopur | Khajuri BO | 📍 847212 | Madhubani | Branch Post Office |
| 592 | Kesuli | Dhakjari BO | 📍 847223 | Benipatti | Branch Post Office |
| 593 | Kewan | Rajnagar SO Madhubani | 📍 847235 | Rajnagar | Post Office - PO |
| 594 | Kewatna | Keotna BO | 📍 847402 | Ghoghardiha | Branch Post Office |
| 595 | Khaira | Imadpatti BO | 📍 847404 | Jhanjharpur | Branch Post Office |
| 596 | Khaira Shivottar | Imadpatti BO | 📍 847404 | Jhanjharpur | Branch Post Office |
| 597 | Khairi Banka | Banka BO | 📍 847121 | Bisfi | Branch Post Office |
| 598 | Khairi Banka | Keoti Ranway SO | 📍 847121 | Bisfi | Post Office - PO |
| 599 | Khajauli | Kasma Marar BO | 📍 847228 | Khajauli | Branch Post Office |
| 600 | Khajauli | Khajauli SO | 📍 847228 | Khajauli | Post Office - PO |