| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 201 | Kaini | Dhira BO | 📍 811315 | Halsi | Branch Post Office |
| 202 | Kaira | Kajra SO | 📍 811309 | Surajgarha | Post Office - PO |
| 203 | Kakrauri | Parsama BO | 📍 811311 | Halsi | Branch Post Office |
| 204 | Kaleanpur | Barhiya SO | 📍 811302 | Surajgarha | Post Office - PO |
| 205 | Kalianpur | L. Kalyanpur BO | 📍 811302 | Barahiya | Branch Post Office |
| 206 | Kamarpur | Birupur BO | 📍 811302 | Barahiya | Branch Post Office |
| 207 | Kamiapur | Bandhu Bagicha BO | 📍 811310 | Lakhisarai | Branch Post Office |
| 208 | Kandarpa | Lakhisarai SO | 📍 811311 | Lakhisarai | Post Office - PO |
| 209 | Kaniari | Dhira BO | 📍 811315 | Halsi | Branch Post Office |
| 210 | Karihara | Lakhisarai SO | 📍 811311 | Lakhisarai | Post Office - PO |
| 211 | Kasba | Piri Bazar SO | 📍 811112 | Surajgarha | Post Office - PO |
| 212 | Kasba Budhauli | Piri Bazar SO | 📍 811112 | Surajgarha | Post Office - PO |
| 213 | Kasoi | Pipariya BO | 📍 811302 | Pipariya | Branch Post Office |
| 214 | Katehar | Surajgaraha SO | 📍 811106 | Surajgarha | Post Office - PO |
| 215 | Kathautia | Kendi BO | 📍 811311 | Ramgarh Chowk | Branch Post Office |
| 216 | Kawadpur | Kabadpur BO | 📍 811106 | Surajgarha | Branch Post Office |
| 217 | Kawaia | Lakhisarai SO | 📍 811311 | Surajgarha | Post Office - PO |
| 218 | Kendi BO | Kendi BO | 📍 811306 | Lakhisarai | Branch Post Office |
| 219 | Kesaura | Lakhisarai SO | 📍 811311 | Lakhisarai | Post Office - PO |
| 220 | Kesopur | Kajra SO | 📍 811309 | Surajgarha | Post Office - PO |
| 221 | Khagaur | Kiul-rs SO | 📍 811310 | Lakhisarai | Branch Post Office |
| 222 | Khairi | Mahisona BO | 📍 811311 | Lakhisarai | Branch Post Office |
| 223 | Kharagwara | Sharma BO | 📍 811311 | Lakhisarai | Branch Post Office |
| 224 | Kharanwan | Chewara SO | 📍 811304 | Halsi | Post Office - PO |
| 225 | Kharkuan | Lakhisarai SO | 📍 811311 | Lakhisarai | Post Office - PO |
| 226 | Khawa Rajpur | Kiranpur BO | 📍 811106 | Surajgarha | Branch Post Office |
| 227 | Khirho | Dihra BO | 📍 811311 | Lakhisarai | Branch Post Office |
| 228 | Khokhna | Kuthaut BO | 📍 811101 | Halsi | Branch Post Office |
| 229 | Khoriari | Pratappur BO | 📍 811107 | Halsi | Branch Post Office |
| 230 | Khudiban | Abhaypur BO | 📍 811112 | Surajgarha | Branch Post Office |
| 231 | Khutaha | Khutha BO | 📍 811302 | Barahiya | Branch Post Office |
| 232 | Khuttupar | Pacham BO | 📍 811311 | Lakhisarai | Branch Post Office |
| 233 | Kiranpur | Kiranpur BO | 📍 811106 | Surajgarha | Branch Post Office |
| 234 | Kishanpur | Rehua BO | 📍 811311 | Surajgarha | Branch Post Office |
| 235 | Koli | Parsama BO | 📍 811311 | Ramgarh Chowk | Branch Post Office |
| 236 | Konag | Konag BO | 📍 811311 | Halsi | Branch Post Office |
| 237 | Konag BO | Konag BO | 📍 811306 | Lakhisarai | Branch Post Office |
| 238 | Koria Zilla Bihar | Damodar Pur BO | 📍 811311 | Lakhisarai | Branch Post Office |
| 239 | Koriazilla Bhagalpur | Damodar Pur BO | 📍 811311 | Lakhisarai | Branch Post Office |
| 240 | Kumadar | Gopalpur BO | 📍 811310 | Lakhisarai | Branch Post Office |
| 241 | Kumaitha | Pratappur BO | 📍 811107 | Halsi | Branch Post Office |
| 242 | Kurauta | Lakhisarai SO | 📍 811311 | Lakhisarai | Post Office - PO |
| 243 | Kusokhar | Kushumbha BO | 📍 811105 | Halsi | Branch Post Office |
| 244 | Kuthwa | Chetan Tola Khutha BO | 📍 811302 | Barahiya | Branch Post Office |
| 245 | Kuthwa | Pipariya BO | 📍 811302 | Barahiya | Branch Post Office |
| 246 | Lachhmipur | Kabadpur BO | 📍 811106 | Surajgarha | Branch Post Office |
| 247 | Lachhmipur | Birupur BO | 📍 811302 | Barahiya | Branch Post Office |
| 248 | Lachhmipur | L. Kalyanpur BO | 📍 811302 | Barahiya | Branch Post Office |
| 249 | Lachhmipur | Singhchak BO | 📍 811310 | Lakhisarai | Branch Post Office |
| 250 | Lahuara | Pratappur BO | 📍 811107 | Halsi | Branch Post Office |