| Place | Post Code |
|---|---|
| Attidiya North, Rathmalana | None |
| Attidiya South, Rathmalana | None |
| Kandawala, Rathmalana | None |
| Katukurunduwatta, Rathmalana | None |
| Kawdana West, Rathmalana | None |
| Mount Lavinia, Rathmalana | 10370 |
| Piriwena, Rathmalana | None |
| Rathmalana East, Rathmalana | None |
| Rathmalana West, Rathmalana | None |
| Vihara, Rathmalana | None |
| Watarappala, Rathmalana | None |
| Wathumulla, Rathmalana | None |
| Wedikanda, Rathmalana | None |