Diamond Harbour I is Taluka (Tehsil) in South 24 Parganas district of West Bengal state. Diamond Harbour I has 8 areas (postal offices).
| Pin code | Area | District | Taluka | Postal Status |
|---|---|---|---|---|
| 743368 | Abdalpur PIN Code | South 24 Parganas | Diamond Harbour I | Branch Office |
| 743368 | Chandannagar PIN Code | South 24 Parganas | Diamond Harbour I | Branch Office |
| 743331 | Dakshin Hazi Pur PIN Code | South 24 Parganas | Diamond Harbour I | Sub Office |
| 743331 | Diamond Harbour PIN Code | South 24 Parganas | Diamond Harbour I | Head Office |
| 743331 | Diamond Harbour Cc PIN Code | South 24 Parganas | Diamond Harbour I | Sub Office |
| 743331 | Diamond Harbour New Town PIN Code | South 24 Parganas | Diamond Harbour I | Sub Office |
| 743331 | Diamond Harbour Rs PIN Code | South 24 Parganas | Diamond Harbour I | Sub Office |
| 743331 | Fakir Chand College PIN Code | South 24 Parganas | Diamond Harbour I | Sub Office |