| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 351 | Kanchan Bari | Karhabari BO | 📍 855101 | Dighalbank | Post Office - PO |
| 352 | Kanchanbari | Bahadurganj SO Kishanganj | 📍 855101 | Terhagachh | Post Office - PO |
| 353 | Kanchanbari Istamrar | Bibiganj BO | 📍 855101 | Terhagachh | Branch Post Office |
| 354 | Kanhaiabari | Kanalyabarihat BO | 📍 855107 | Kochadhamin | Branch Post Office |
| 355 | Kaparporbandha | Kishanganj SO | 📍 855107 | Kishanganj | Post Office - PO |
| 356 | Karehbari | Patkoihat BO | 📍 855107 | Kochadhamin | Branch Post Office |
| 357 | Karigaon Milik | Poth RS BO | 📍 855117 | Pothia | Branch Post Office |
| 358 | Karua Mani | Kharudah BO | 📍 855107 | Thakurganj | Branch Post Office |
| 359 | Karua Mani | B.B. Bharatpur BO | 📍 855108 | Thakurganj | Branch Post Office |
| 360 | Karua Mari | Kharudah BO | 📍 855107 | Thakurganj | Branch Post Office |
| 361 | Karuamani | Mangura BO | 📍 855101 | Dighalbank | Branch Post Office |
| 362 | Kasba Kaliaganj | Taiyabpur SO | 📍 855117 | Pothia | Post Office - PO |
| 363 | Kasbe Anganj UrfKasbaKhodaganj | Khodaganj BO | 📍 855108 | Bahadurganj | Branch Post Office |
| 364 | Kashibari | Kansibarihat BO | 📍 855107 | Kochadhamin | Branch Post Office |
| 365 | Kast Karam Ali | Dighalbank BO | 📍 855101 | Dighalbank | Branch Post Office |
| 366 | Katahalia | Kishanganj SO | 📍 855107 | Kishanganj | Post Office - PO |
| 367 | Katahalia Bhag | Kishanganj SO | 📍 855107 | Kishanganj | Post Office - PO |
| 368 | Katamata | Dhanpatganj BO | 📍 855115 | Kochadhamin | Branch Post Office |
| 369 | Kathalbari | Bangama BO | 📍 855101 | Bahadurganj | Branch Post Office |
| 370 | Kathalbari | Bishanpur BO | 📍 855101 | Kochadhamin | Branch Post Office |
| 371 | Kathalbari | Khodaganj BO | 📍 855108 | Bahadurganj | Branch Post Office |
| 372 | Katharo | Saraikuri BO | 📍 855108 | Thakurganj | Branch Post Office |
| 373 | Katmohan | Singhia BO | 📍 855107 | Kishanganj | Branch Post Office |
| 374 | Keso Jara | Raipur BO | 📍 855107 | Pothia | Branch Post Office |
| 375 | Khajuribari | Gamharia BO | 📍 854333 | Terhagachh | Branch Post Office |
| 376 | Khanabari | Saraikuri BO | 📍 855108 | Thakurganj | Branch Post Office |
| 377 | Khaniabad | Fatehpur BO | 📍 855101 | Terhagachh | Branch Post Office |
| 378 | Khara Suhia | Matiari BO | 📍 855101 | Terhagachh | Branch Post Office |
| 379 | Kharij Khaniabad | Fatehpur BO | 📍 855101 | Terhagachh | Branch Post Office |
| 380 | Kharij Kumhia | Khodaganj BO | 📍 855108 | Bahadurganj | Branch Post Office |
| 381 | Kharkhari | Raipur BO | 📍 855107 | Pothia | Branch Post Office |
| 382 | Kharna | Taiyabpur SO | 📍 855117 | Thakurganj | Post Office - PO |
| 383 | Kharra | Matiari BO | 📍 855101 | Terhagachh | Branch Post Office |
| 384 | Kharra Belbari | Matiari BO | 📍 855101 | Terhagachh | Branch Post Office |
| 385 | Kharrakasht | Matiari BO | 📍 855101 | Terhagachh | Branch Post Office |
| 386 | Kharsel | Khodaganj BO | 📍 855108 | Bahadurganj | Branch Post Office |
| 387 | Kharudah | Kharudah BO | 📍 855107 | Thakurganj | Branch Post Office |
| 388 | Khatia Pichhla | Khatia Pichhia BO | 📍 855117 | Pothia | Branch Post Office |
| 389 | Khaurdah | Kharudah BO | 📍 855107 | Thakurganj | Branch Post Office |
| 390 | Kheria | Kheria BO | 📍 854108 | Kishanganj | Branch Post Office |
| 391 | Khodaganj | Khodaganj BO | 📍 855108 | Kishanganj | Branch Post Office |
| 392 | Khodaganj | Kishanganj Bazar SO | 📍 855108 | Kishanganj | Post Office - PO |
| 393 | Khudra | Powakhali BO | 📍 855108 | Thakurganj | Branch Post Office |
| 394 | Khunia Toli | Bibiganj BO | 📍 855101 | Terhagachh | Branch Post Office |
| 395 | Kirdah Samda | Kishanganj SO | 📍 855107 | Kishanganj | Post Office - PO |
| 396 | Kishanganj | Kishanganj SO | 📍 855107 | Kishanganj | Post Office - PO |
| 397 | Kishanganj | Kishanganj Bazar SO | 📍 855108 | Kishanganj | Post Office - PO |
| 398 | Kochadhamin | Kochadhaman BO | 📍 855115 | Kochadhamin | Branch Post Office |
| 399 | Koia | Jia pokhar BO | 📍 855108 | Thakurganj | Branch Post Office |
| 400 | Koimari | Bangama BO | 📍 855101 | Bahadurganj | Branch Post Office |