Howajan is Taluka (Tehsil) in Sonitpur district of Assam state. Howajan has 8 areas (postal offices).
| Pin code | Area | District | Taluka | Postal Status |
|---|---|---|---|---|
| 784169 | Diphalu Satra PIN Code | Sonitpur | Howajan | Branch Office |
| 784169 | Howajair PIN Code | Sonitpur | Howajan | Sub Office |
| 784169 | Kamdewal PIN Code | Sonitpur | Howajan | Branch Office |
| 784169 | Kharaiguri PIN Code | Sonitpur | Howajan | Branch Office |
| 784169 | Khatargaon PIN Code | Sonitpur | Howajan | Branch Office |
| 784169 | Lohitmukh PIN Code | Sonitpur | Howajan | Branch Office |
| 784169 | Rawanmukh PIN Code | Sonitpur | Howajan | Branch Office |
| 784169 | Subansirimukh PIN Code | Sonitpur | Howajan | Branch Office |