Hewainna Postal Code
| City | Postal Code | District |
|---|---|---|
| Kalatuwawa | 10718 | Colombo |
| Kosgama | 10730 | Colombo |
| Akarawita | 10732 | Colombo |
| Gampaha | 11000 | Gampaha |
| Ragama | 11010 | Gampaha |
| Batuwatta | 11011 | Gampaha |
| Walpola | 11012 | Gampaha |
| Ganemulla | 11020 | Gampaha |
| Bollete | 11024 | Gampaha |
| Udugampola | 11030 | Gampaha |
| Madelgamuwa | 11033 | Gampaha |
| IhalaUggalboda | 11034 | Gampaha |
| Bemmulla | 11040 | Gampaha |
| Pethiyagoda | 11043 | Gampaha |
| Korase | 11044 | Gampaha |