Kalyanpur is Taluka (Tehsil) in East Champaran district of Bihar state. Kalyanpur has 9 areas (postal offices).
| Pin code | Area | District | Taluka | Postal Status |
|---|---|---|---|---|
| 845413 | Bakarpur Jagat PIN Code | East Champaran | Kalyanpur | Sub Office |
| 845432 | Bhgwatia PIN Code | East Champaran | Kalyanpur | Branch Office |
| 845432 | Bhopatpur PIN Code | East Champaran | Kalyanpur | Branch Office |
| 845432 | Darmaha PIN Code | East Champaran | Kalyanpur | Branch Office |
| 845432 | Gariba PIN Code | East Champaran | Kalyanpur | Branch Office |
| 845432 | Hazipur PIN Code | East Champaran | Kalyanpur | Branch Office |
| 845432 | Jasouli Jamunia PIN Code | East Champaran | Kalyanpur | Branch Office |
| 845432 | Konia PIN Code | East Champaran | Kalyanpur | Branch Office |
| 845432 | Siswa Patna PIN Code | East Champaran | Kalyanpur | Branch Office |