Companies catalogue
- O D'Mello Joinery, Riverwood
- O'Brien's Picture Frames, Toongabbie
- OC Automotive, Lansvale
- OPUS 4, Killara
- ORION AUTO'S Quality Used Cars & Service Centre Penrith, Penrith
- OUTDURE Exterior Living Solutions, Waterloo
- OZ Crane Hire, Sydney
- OZ Design Furniture, Liverpool
- OZ Design Furniture, Penrith
- OZ Design Furniture Campbelltown, Campbelltown
- OZ Design Furniture Caringbah, Caringbah
- Oakhill Gourmet Meats, Castle Hill
- Oaks Quality Turf, Shoalhaven Heads
- Oasis Asset Management, Wollongong
- Oatley Clock Butchery, Oatley
- Ocean Link Transport Services, Cabramatta
- Office of Environment and Heritage, Fitzroy Falls
- Officebuilt, Rockdale
- Officeworks Lewisham, Lewisham
- Officeworks Punchbowl, Punchbowl
- Old Firm Construction, Bondi
- Oldfields Scaffolding Sydney, Campbelltown
- Oldtimer Centre, Marrickville
- Oliveri's Metro-Link Bus & Charter, Busby
- Olsson Bros Carriers & Crane Hire, Smithfield
- Olympus Australia Pty Ltd, Macquarie Park
- Omega Furniture, Minto
- On Line Pipe & Cable Locating, Blacktown
- One Dot Project Management, Brookvale
- One Stop Roofing Shop, Caringbah
- One Tec Security - Security Alarm Systems Supplier, Castle Hill
- One Tech Security (citywide), Baulkham Hills
- One Work, Oakhurst
- Onroad Autos, Minchinbury
- OntheLine Business Tutoring, Lilli Pilli
- Onyx Ventures, Kellyville
- Opposite Lock Alice Springs, Alice Springs
- Opticables PTY Ltd., Mortdale
- Optical Solutions Australia, Silverwater
- Optical Solutions Australia (OSA), Alexandria
- Optus Business Centre South Coast, Wollongong
- Optus Centre Sydney, Macquarie Park
- Optus Exchanges, Blacktown
- Oracle Law, Horsley Park
- Orangeville Meat Co, Gregory Hills
- Organic Energy, Camden
- Osaka Motors NSW, Cabramatta
- Oscar Design & Construction, Baulkham Hills
- Osier Belle Outdoor Furniture, Neutral Bay
- Ossak Infotech, Saint Marys
- Our Local Butcher, Kirrawee
- Outsource My Marketing - Brisbane, Strathpine
- Own Home Protection, Revesby
- Oxford Bathrooms Renovations Brookvale, Brookvale
- OzCar / Australian Fleet Sales, Campbelltown
- OzCar / Australian Fleet Sales, Lansvale
- OzCar / Australian Fleet Sales, Granville
- OzCar / Australian Fleet Sales, Penrith
- OzInn Tiles, Arndell Park
- Ozcorp Motors, Homebush
- Ozzy Car Sales, Penrith
- orangeweb, Moss Vale