Diwalakada Postal Code
| City | Postal Code | District |
|---|---|---|
| Govinna | 12310 | Kalutara |
| Anguruwatota | 12320 | Kalutara |
| Uduwara | 12322 | Kalutara |
| Horana | 12400 | Kalutara |
| Pokunuwita | 12404 | Kalutara |
| Gonapola Junction | 12410 | Kalutara |
| Millaniya | 12412 | Kalutara |
| Paragastota | 12414 | Kalutara |
| Dombagoda | 12416 | Kalutara |
| Kananwila | 12418 | Kalutara |
| Millewa | 12422 | Kalutara |
| Miwanapalana | 12424 | Kalutara |
| Kuda Uduwa | 12426 | Kalutara |
| Kandanagama | 12428 | Kalutara |
| Poruwedanda | 12432 | Kalutara |