Although part of the Melbourne suburban network, Telegraph Offices on the Mornington Peninsula can be treated separately as they had special lines connecting them.
Although Frankston is often taken as the start of the Mornington Peninsula, the offices included here start a little further to the north at Mordiallac at the same latitude as Dandenong which is the start of the Gippsland line.
Separate lines were constructed to Cape Schank and Flinders - probably to avoid difficulties which may arise in the case of a maritime situations and to reduce the traffic between these stations and the Melbourne Central Office.
The following Telegraph Offices are included on this page:
| Bass | Cape Shank | Dromana | Flinders | Frankston | Mordiallac |
| Mornington | Portsea | Quarantine Station | Snapper Point | Sorrento |