- Oakhurst to Ovolo 1888 Darling Harbour
- Oakville to Ovolo 1888 Darling Harbour
- Oatlands to Ovolo 1888 Darling Harbour
- Oatley to Ovolo 1888 Darling Harbour
- Old Guildford to Ovolo 1888 Darling Harbour
- Old Toongabbie to Ovolo 1888 Darling Harbour
- Oran Park to Ovolo 1888 Darling Harbour
- Orchard Hills to Ovolo 1888 Darling Harbour
- Oxford Falls to Ovolo 1888 Darling Harbour
- Oxley Park to Ovolo 1888 Darling Harbour
- Oyster Bay to Ovolo 1888 Darling Harbour
- Sydney Airport to Ovolo 1888 Darling Harbour
- Ovolo 1888 Darling Harbour to Oakhurst
- Ovolo 1888 Darling Harbour to Oakville
- Ovolo 1888 Darling Harbour to Oatlands
- Ovolo 1888 Darling Harbour to Oatley
- Ovolo 1888 Darling Harbour to Old Guildford
- Ovolo 1888 Darling Harbour to Old Toongabbie
- Ovolo 1888 Darling Harbour to Oran Park
- Ovolo 1888 Darling Harbour to Orchard Hills
- Ovolo 1888 Darling Harbour to Oxford Falls
- Ovolo 1888 Darling Harbour to Oxley Park
- Ovolo 1888 Darling Harbour to Oyster Bay
- Ovolo 1888 Darling Harbour to Sydney Airport