Companies catalogue
- O'Malleys Automotive Repairs, Hornsby, Hornsby
- O'Toole Automotives, Tuggerah
- O.P's Tavern, Osborne Park
- OK Gallery, Northbridge
- ORS Group, Kwinana Town Centre
- OUTdance, Perth
- Oakwood Primary School, Meadow Springs
- Ocean Key Pastry House, Clarkson
- Ocean Reef Chinese Restaurant, Heathridge
- Ocean Reef Taekwondo Martial Arts, Ocean Reef
- Ocean Ridge Junior Cricket Club, Heathridge
- Ocean Ridge Junior Football Club, Heathridge
- Oceanic Bar & Grill, Mandurah
- Oceanic Waterbabies, Success
- Oceanic Waterbabies, Innaloo
- Oceans 6019, Scarborough
- Ochre Contemporary Dance Company, Subiaco
- Octagon Theatre, Crawley
- Octief Pty Ltd, Belmont
- Odessa Smash Repairs, Rosebery
- Ogdens Bar & Grill, South Perth
- Ohnamiya, Myaree
- Oil Mallee Association Of Australia, Fremantle
- Okey Homes, Sunbury
- Old Bank Building, Perth
- Old Court House Law Museum, Perth
- Old Mill Theatre, South Perth
- Old Shanghai, Fremantle
- Olmate 4×4, Tuggerah
- On-Cue Warwick, Warwick
- One Mob Studios, Joondalup
- One World Family Support Australia (OWFSA), Warnbro
- One2One, Midland
- Onelife ITF Taekwon-Do, Gwelup
- Onstage Arts, Maddington
- Ootong & Lincoln, South Fremantle
- Opal Armadale, Armadale
- Opal Cafe, Northbridge
- Open Colleges School of Health, Perth
- Opposite Lock Central Coast, Gosford
- Oracy Australia Association Inc., Cottesloe
- Orbit Homes - Harpley Werribee Display Centre, Werribee
- Orelia Chinese & Asian Cuisine Take Away, Orelia
- Orelia Primary School, Orelia
- Orelia Primary school, Orelia Western
- Organic Association of Western Australia, Booragoon
- Oriental Mandarin Chinese Restaurant, Northbridge
- Oringnal paintings and artwork, Meliville
- Osborne & Davis Automotive Repairs, West Gosford
- Osborne Park Community Centre - City Of Stirling, Perth
- Osborne Park Cricket Club Inc., Tuart Hill
- Osborne Park Massage Eden 4 Main Street, Osborne Park
- Osborne Park Renault & Suzuki, Osborne Park
- Osborne Park Volkswagen, Osborne Park
- Our Table, Bedford
- Outback Jacks Northbridge - Australian Steak House, Northbridge
- Outram Cafe, West Perth
- Oven Crisp Bakery, Riverton
- Oven Crisp Bakery, Bull Creek
- Oven Door Bakery Cafe Drover, Wanneroo
- Overwhelm Mixed Martial Arts, Perth
- Owen's Paint and Panel Repairs, West Gosford