Companies catalogue
- O'Driscoll Sports & Family, Guelph
- OCDetailing, Guelph
- OLG Slots at Grand River Raceway, Elora
- OPTVIA Logistics and Warehousing Inc., Guelph
- Oak + Fort, Edmonton
- Oakville Business Park, Oakville
- Oakville Cardiologists Diagnostic Centre - North Site, Oakville
- Oakville Chamber of Commerce, Oakville
- Oakville Clerks Department, Oakville
- Oakville Condo Rentals Online, Oakville
- Oakville Condos - Ryan Chelak, Simply Condos, Oakville
- Oakville Conservatory of Music, Oakville
- Oakville Curling Club Ltd, Oakville
- Office Plus Head Office, Guelph
- Oh Baby Fitness, Cambridge
- Oliva Carpet & Rug Cleaning, Oakville
- Oliver Chimney Services, Oakville
- Olsen Europe, Edmonton
- On The Spot Carpet Cleaning Specialists, Oakville
- Oneira Corporation, Oakville
- Ontario Agriculture Dept, Guelph
- Ontario Christian Books, Mississauga
- Ontario Community & Social Svc, Guelph
- Ontario Conservatory Music, Mississauga
- Ontario Conservatory Of Music, Mississauga
- Ontario Conservatory Of Music, Brampton
- Ontario Conservatory of Music, Milton
- Ontario Conservatory of Music, Mississauga
- Ontario Court of Justice, Mississauga
- Ontario Driver Examination Ofc, Guelph
- Ontario Early Years Ctr, Guelph
- Ontario Provincial Police, Rockwood
- Ontario Provincial Police, Fergus
- Ontario Solicitor General Ofc, Guelph
- Ontario Special Olympics Cambridge, Cambridge
- Ontario Specialised Services, Guelph
- Ontario Wastewater Treatment, Cambridge
- Opus Lounge, Guelph
- Orangeville Chiropractor - Dufferin Family Chiropractic, Orangeville
- Orangeville Public Library - Mill St., Orangeville
- Orangeville Town Hall, Orangeville
- Orimimi Ladies’ Clothing, Edmonton
- Ospringe Chimney Services, Acton
- Our Lady of Fatima Catholic Elementary School, Cambridge
- Our Lady of Lourdes School, Waterloo
- Our Lady of Mount Carmel Catholic Elementary School, Hamilton
- Ovation Condos, Mississauga
- Oxygen Clothing, Edmonton
- oycc, Kitchener