| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 501 | Jagat | Kapileshwar Asthan BO | 📍 847238 | Madhubani | Branch Post Office |
| 502 | Jagatpur | Jagatpur BO | 📍 847213 | Madhubani | Branch Post Office |
| 503 | Jagatpur | Jagatpur BO | 📍 847402 | Phulparas | Branch Post Office |
| 504 | Jagban | Jagwan BO | 📍 847304 | Bisfi | Branch Post Office |
| 505 | Jagir Sagram | Rahua Sangram BO | 📍 847408 | Madhepur | Branch Post Office |
| 506 | Jainagar | Jaynagar SO | 📍 847226 | Jainagar | Post Office - PO |
| 507 | Jairampur | Singhia Deorhi BO | 📍 847306 | Bisfi | Branch Post Office |
| 508 | Jalsain | Jalsain BO | 📍 847411 | Andhratharhi | Branch Post Office |
| 509 | Jamaila | Madna BO | 📍 847401 | Andhratharhi | Branch Post Office |
| 510 | jamsar | Laukahi BO | 📍 847108 | Laukahi | Branch Post Office |
| 511 | Jamthar | Hata Rupauli BO | 📍 847404 | Jhanjharpur | Branch Post Office |
| 512 | Janipur | Jagwan BO | 📍 847304 | Bisfi | Branch Post Office |
| 513 | Jarauli | Nirmali SO Supaul | 📍 847452 | Laukahi | Branch Post Office |
| 514 | Jarauli | Dighia BO | 📍 847452 | Laukahi | Branch Post Office |
| 515 | Jaso | Jaso BO | 📍 847225 | Basopatti | Branch Post Office |
| 516 | Jasrajpur | Misrauli BO | 📍 847224 | Babubarhi | Branch Post Office |
| 517 | Jatahi | Khozpur BO | 📍 847224 | Babubarhi | Branch Post Office |
| 518 | Jatulia | Dubahi Mahinathpur BO | 📍 847225 | Basopatti | Branch Post Office |
| 519 | Jhagaraua | Laukaha SO | 📍 847421 | Laukaha | Post Office - PO |
| 520 | Jhajhri | Basania BO | 📍 847421 | Laukaha | Branch Post Office |
| 521 | Jhakhrahi | Dhanauja BO | 📍 847409 | Phulparas | Branch Post Office |
| 522 | Jhanjharpur | Jhanjharpur SO | 📍 847404 | Jhanjharpur | Post Office - PO |
| 523 | Jhanjharpur RS | Jhanjharpur RS SO | 📍 847403 | Jhanjharpur | Post Office - PO |
| 524 | Jhanjhpatti Asa | Ekhathha BO | 📍 847227 | Laukaha | Branch Post Office |
| 525 | Jhanjpatti Doman | Ekhathha BO | 📍 847227 | Laukaha | Branch Post Office |
| 526 | jhaua | Kako BO | 📍 847404 | Jhanjharpur | Branch Post Office |
| 527 | Jhauri | Laukahi BO | 📍 847108 | Laukahi | Branch Post Office |
| 528 | Jhitki | Hisardeorhi BO | 📍 847230 | Harlakhi | Branch Post Office |
| 529 | Jhonjhi | Paraul BO | 📍 847229 | Benipatti | Branch Post Office |
| 530 | Jiraul | Jiraul BO | 📍 847230 | Harlakhi | Branch Post Office |
| 531 | Jiroga | Bharkhori BO | 📍 847108 | Laukahi | Branch Post Office |
| 532 | Jitwarpur | Jitwarpur BO | 📍 847215 | Madhubani | Branch Post Office |
| 533 | Jogia | Padma BO | 📍 847226 | Ladania | Branch Post Office |
| 534 | Jonki | Jonki BO | 📍 847225 | Basopatti | Branch Post Office |
| 535 | Kachhara | Benipatti SO | 📍 847223 | Benipatti | Post Office - PO |
| 536 | Kachhua | Kachhua BO | 📍 847410 | Lakhnaur | Branch Post Office |
| 537 | Kachhwi | Kachhubi BO | 📍 847410 | Lakhnaur | Branch Post Office |
| 538 | Kachnarwa | Kachhua BO | 📍 847410 | Laukahi | Branch Post Office |
| 539 | Kaithahi | Kaithai BO | 📍 847236 | Rajnagar | Branch Post Office |
| 540 | Kaithinia | Kaithinia BO | 📍 847403 | Lakhnaur | Branch Post Office |
| 541 | Kajiana | Kaluahi SO | 📍 847229 | Madhubani | Post Office - PO |
| 542 | kajiana | Maksuda BO | 📍 847234 | Madhubani | Branch Post Office |
| 543 | Kakahia | Laukahi BO | 📍 847108 | Laukahi | Branch Post Office |
| 544 | Kako | Kako BO | 📍 847404 | Jhanjharpur | Branch Post Office |
| 545 | Kakraul | Kakraul BO | 📍 847238 | Madhubani | Branch Post Office |
| 546 | Kala Patti | Kalapatti BO | 📍 847409 | Phulparas | Branch Post Office |
| 547 | Kalikapur | Kalikapur BO | 📍 847228 | Kaluahi | Branch Post Office |
| 548 | Kalikapur | Kalikapur BO | 📍 847402 | Madhepur | Branch Post Office |
| 549 | kalna | Basopatti SO | 📍 847225 | Harlakhi | Post Office - PO |
| 550 | Kalripatti | Hudra BO | 📍 847227 | Laukaha | Branch Post Office |