Companies catalogue
- O G Hotel, Klemzig
- O'Connell Inn, North Adelaide
- O'Furno Bakery & Espresso Bar, Campbelltown
- O'Sullivan Beach Children's Centre, O'Sullivan Beach
- OAR, West Lakes Shore
- OARS Community, Adelaide
- OC Challenge Incorporated, Semaphore
- OCEANTECH DESIGN, Largs North
- ON Business Partner Program - City of Onkaparinga, Noarlunga Centre
- OPSM Booval, Booval
- OPSM Springfield, Springfield Lakes
- ORIGINAL BOOTCAMP City South, Adelaide
- ORIGINAL BOOTCAMP North Adelaide, North Adelaide
- OTR Para Hills, Para Hills
- OTR Pooraka, Pooraka
- Oakbank Bowling Club, Oakbank
- Oakbank Pizza Bar & Cafe, Oakbank
- Oakbank Racing Club, Oakbank
- Oaklands Recreation Plaza, Oaklands Park
- Oaks Hotel, Adelaide
- Oaks Liberty Towers, Glenelg
- Oasis Transportable Buildings & Homes, Smithfield
- Ocean View College (Harbor View Campus), Port Adelaide
- Offenders Aid & Rehabilitation Services, Brompton
- Office National Yatala, Stapylton
- Office for Recreation & Sport, Kidman Park
- Office of Parliamentary Counsel, Adelaide
- Office of the Technical Regulator, Adelaide
- Office of the Training Advocate, Adelaide
- Officeworks Oxley, Oxley
- Official PokeCentre Australia, Noarlunga Centre
- Oktoberfest in the Gardens Adelaide, Wayville
- Okuma Australia, Thebarton
- Olaku, Hallett Cove
- Old Collegians Rugby Football Club, Linden Park
- Old House Chinese, North Adelaide
- Old Noarlunga Hotel, Old Noarlunga
- Old Reynella Interchange, Old Reynella
- Old School House, Pewsey Vale
- Old Town Cafe, Old Reynella
- Oliver's Carpentry, Brompton
- Olympic Sports Clinic, Hallett Cove
- Om Yoga, Adelaide
- Ombudsman SA, Adelaide
- On the Ball Health & Fitness, Aldinga Beach
- One Care Medical Centre, Pennington
- One Fork Short, Welland
- One Tree Hill Primary School, One Tree Hill
- One Tree Hill Progress Association, One Tree Hill
- One Tree Hill Scout Group, One Tree Hill
- One on One Nail Tuition, Torrensville
- Onkaparinga Cubs Home Field, Christie Downs
- Onkaparinga River National Park Rock Climbing and Abseiling Area, Clarendon
- Open Book Howden, Saint Marys
- Opie's Bakery Cafe, Unley Park
- Oporto, Brompton
- Oporto - Thorngate Drive Thru (OTR), Thorngate
- Oporto Mawson Lakes, Mawson Lakes
- Oporto Tranmere, Tranmere
- Optima Psychologists & Mediators - Cole Alexandra, Glenunga
- Optimatics, Adelaide
- Optimistic Kids, Adelaide
- Optus Beenleigh, Beenleigh
- Optus Booval Fair, Booval
- Optus Forest Lake, Forest Lake
- Optus World Ipswich Ipswich, Ipswich
- Orange Outdoors, Hillcrest
- Oreo Builders, Westbourne Park
- Orientai, Holden Hill
- Oriental House, Firle
- Oriental Therapies, Rose Park
- Original Charcoal Chicken, Seaton
- Osmond Terrace Function Centre, Norwood
- Ostomy Association of SA Inc. ( In Case Of Emergency Please Attend Your Local Public Hospital ), Kidman Park
- Ottoway Engineering, Wingfield
- Ottoway Wood Bakery, Ottoway
- Our Lady Queen of Peace School, Albert Park
- Our Lady of Dolours, Kingswood
- Our Lady of Grace, Glengowrie
- Our Lady of Grace School, Glengowrie
- Our Lady of Hope Chapel, Golden Grove
- Our Lady of Hope School, Greenwith
- Our Lady of La Vang Special School, Flinders Park
- Our Lady of Mt Carmel Parish School Pennington, Pennington
- Our Lady of The Sacred Heart College, Enfield
- Our Lady of The Visitation Catholic School, Taperoo
- Our Lady of the Rosary Catholic Church, Prospect
- Our Lady of the Rosary Catholic Church, Stirling
- Our Lady of the Way, Glenalta
- Outback Encounter, Thebarton
- Outdoor Accessories, Golden Grove
- Outside Concepts, Adelaide
- Overseas Chinese Association, Findon
- Oxfam Australia Trading PTY Ltd., Athol Park
- OzAsia Snack Bar, Wingfield
- OzHarvest SA, Bowden
- OzSpy Security Solutions, Slacks Creek
- Ozman, Para Hills West
- oaks plaza, Glenelg
- of simpler times, Magill