| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 301 | Kataia Bhulia | Baltharwa BO | 📍 852105 | Saraigarh Bhaptiyahi | Branch Post Office |
| 302 | Kataia Mahe | Kataia Mahe BO | 📍 852131 | Pipra | Branch Post Office |
| 303 | Kataia Mahe | Kataia Mahe | 📍 852134 | Supaul | Branch Post Office |
| 304 | Kataia Milik | Kataia Mahe BO | 📍 852131 | Pipra | Branch Post Office |
| 305 | Katbansi | Kathbanshi BO | 📍 852110 | Supaul | Branch Post Office |
| 306 | Kathi | Gwalpara BO | 📍 852137 | Chhatapur | Branch Post Office |
| 307 | Katmungra | Tharbitta SO | 📍 852138 | Kishanpur | Post Office - PO |
| 308 | Katrahi Fakirana | Girdharpatti BO | 📍 852137 | Chhatapur | Branch Post Office |
| 309 | Keola | Girdharpatti BO | 📍 852137 | Chhatapur | Branch Post Office |
| 310 | Keotapatti | Tharbitta SO | 📍 852138 | Kishanpur | Post Office - PO |
| 311 | Keotna | Parsharma BO | 📍 852130 | Supaul | Branch Post Office |
| 312 | Khakhai | Kadampura BO | 📍 852131 | Kishanpur | Branch Post Office |
| 313 | Khantaha | Bhimnagar Bairrage SO | 📍 854338 | Basantpur | Post Office - PO |
| 314 | Kharail | Kharail BO | 📍 852131 | Supaul | Branch Post Office |
| 315 | Kharail | Kharail | 📍 852134 | Supaul | Branch Post Office |
| 316 | Khokhaha | Sarojabela BO | 📍 847452 | Marauna | Branch Post Office |
| 317 | Khokhnaha | Khokhnaha | 📍 852134 | Supaul | Branch Post Office |
| 318 | Khorma BO | Khorma BO | 📍 852133 | Supaul | Branch Post Office |
| 319 | Khorman | Khorma BO | 📍 847408 | Marauna | Branch Post Office |
| 320 | Khulharia | Mauahi BO | 📍 847452 | Marauna | Branch Post Office |
| 321 | Khuti | Khunti BO | 📍 852137 | Chhatapur | Branch Post Office |
| 322 | Kishanpur | Kishanpur BO | 📍 852217 | Kishanpur | Branch Post Office |
| 323 | Kishunganj | Mohmmad Ganj BO | 📍 852137 | Chhatapur | Branch Post Office |
| 324 | Kochgawan | Balua Bazar SO | 📍 854339 | Basantpur | Post Office - PO |
| 325 | Kohbarwa | Karjain Bazar SO | 📍 852215 | Raghopur | Post Office - PO |
| 326 | Koni Inamat | Barhara BO | 📍 847452 | Marauna | Branch Post Office |
| 327 | Koraia | Tharbitta SO | 📍 852138 | Kishanpur | Post Office - PO |
| 328 | Korhali | Karjain Bazar SO | 📍 852215 | Saraigarh Bhaptiyahi | Post Office - PO |
| 329 | Koriapatti | Jia Ram Raghopur SO | 📍 852111 | Raghopur | Post Office - PO |
| 330 | Koriapatti | Koria Patti BO | 📍 852214 | Tribeniganj | Branch Post Office |
| 331 | Koskapur | Banailipatti BO | 📍 854340 | Basantpur | Branch Post Office |
| 332 | Koyali | Balua Bazar SO | 📍 854339 | Basantpur | Post Office - PO |
| 333 | Kukur Dhari | Barkurwa BO | 📍 852139 | Tribeniganj | Branch Post Office |
| 334 | Kulipatti | Cahndpiper BO | 📍 852105 | Saraigarh Bhaptiyahi | Branch Post Office |
| 335 | Kunali | Kunauli BO | 📍 847451 | Nirmali | Post Office - PO |
| 336 | kunaulibazar | Kunauli Bazar SO | 📍 847451 | Nirmali | Post Office - PO |
| 337 | Kursan | Nirmali SO Supaul | 📍 847452 | Marauna | Branch Post Office |
| 338 | Kusaha | Kushaha BO | 📍 852139 | Tribeniganj | Branch Post Office |
| 339 | Kusahar | Balua Bazar SO | 📍 854339 | Basantpur | Post Office - PO |
| 340 | Kusahar Arazi | Balua Bazar SO | 📍 854339 | Basantpur | Post Office - PO |
| 341 | Kusmaul | Marauna BO | 📍 847408 | Marauna | Branch Post Office |
| 342 | Lachhminia | Tharbitta SO | 📍 852138 | Kishanpur | Post Office - PO |
| 343 | Lachhminia | Daparkha BO | 📍 852139 | Tribeniganj | Branch Post Office |
| 344 | Lachhminia | Lakshminia BO | 📍 854339 | Chhatapur | Branch Post Office |
| 345 | Lachhmipur | Khunti BO | 📍 852137 | Chhatapur | Branch Post Office |
| 346 | Lachhmipur | Laxmipur BO | 📍 852218 | Tribeniganj | Branch Post Office |
| 347 | Lachhmipur | Balua Bazar SO | 📍 854339 | Basantpur | Post Office - PO |
| 348 | Lachhumandas Chak | Pipra Bazar SO | 📍 852218 | Pipra | Post Office - PO |
| 349 | Lagunia | Raharia BO | 📍 852105 | Nirmali | Branch Post Office |
| 350 | Laharnia | Laharnia BO | 📍 852139 | Tribeniganj | Branch Post Office |