Salkhua is Taluka (Tehsil) in Saharsa district of Bihar state. Salkhua has 7 areas (postal offices).
| Pin code | Area | District | Taluka | Postal Status |
|---|---|---|---|---|
| 852126 | Alani PIN Code | Saharsa | Salkhua | Branch Office |
| 852126 | Bhelwa PIN Code | Saharsa | Salkhua | Branch Office |
| 852126 | Harewa PIN Code | Saharsa | Salkhua | Branch Office |
| 852126 | Koparia PIN Code | Saharsa | Salkhua | Branch Office |
| 852126 | Mobarakpur PIN Code | Saharsa | Salkhua | Branch Office |
| 852126 | Salkhua Bazar PIN Code | Saharsa | Salkhua | Sub Office |
| 852126 | Uteshra PIN Code | Saharsa | Salkhua | Branch Office |