| Place | Post Code |
|---|---|
| Arcadia, Hornsby | 2159 |
| Asquith, Hornsby | 2077 |
| Beecroft, Hornsby | 2119 |
| Berowra, Hornsby | 2081 |
| Berowra Creek, Hornsby | 2082 |
| Berowra Heights, Hornsby | 2082 |
| Berowra Waters, Hornsby | 2082 |
| Berrilee, Hornsby | 2159 |
| Brooklyn, Hornsby | 2083 |
| Canoelands, Hornsby | 2157 |
| Cheltenham, Hornsby | 2119 |
| Cherrybrook, Hornsby | 2126 |
| Cowan, Hornsby | 2081 |
| Dangar Island, Hornsby | 2083 |
| Epping, Hornsby | 2121 |
| Fiddletown, Hornsby | 2159 |
| Forest Glen, Hornsby | 2157 |
| Galston, Hornsby | 2159 |
| Hornsby, Hornsby | 2077 |
| Hornsby Heights, Hornsby | 2077 |
| Laughtondale, Hornsby | 2775 |
| Milsons Passage, Hornsby | 2083 |
| Mount Colah, Hornsby | 2079 |
| Mount Kuring-Gai, Hornsby | 2080 |
| Normanhurst, Hornsby | 2076 |
| North Epping, Hornsby | 2121 |