| #SL | District Name | No. Of Postoffice |
|---|---|---|
| 21. | Madhubani | 414 |
| 22. | Munger | 124 |
| 23. | Muzaffarpur | 437 |
| 24. | Nalanda | 333 |
| 25. | Nawada | 193 |
| 26. | Patna | 447 |
| 27. | Purnia | 191 |
| 28. | Rohtas | 264 |
| 29. | Saharsa | 169 |
| 30. | Samastipur | 386 |
| 31. | Saran | 388 |
| 32. | Sheikhpura | 84 |
| 33. | Sheohar | 34 |
| 34. | Sitamarhi | 306 |
| 35. | Siwan | 322 |
| 36. | Supaul | 209 |
| 37. | Vaishali | 285 |
| 38. | West Champaran | 276 |