- Occupational Health & Safety, Oakville
- Occupational Health Care Professionals, Oakville
- Office Buildings & Parks, Oakville
- Office Partitions & Dividers, Oakville
- Office Space on Rent, Oakville - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Oakville
- Oil & Gas Companies, Oakville
- Oil & Petroleum Products, Oakville - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Oakville
- Oil Change & Lubrication, Oakville - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Oakville
- Opticians, Oakville
- Optometrists, Oakville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Oakville - Eye Clinics
- Orchestras, Symphonies & Bands, Oakville
- Organizing Services & Products – Household & Business, Oakville
- Ornamental Nursery, Oakville
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- Ornamental Nursery Consultants, Oakville
- Ornamental Nursery Services, Oakville
- Orthodontist, Oakville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Oakville - Orthopedic Shoes
- Other Attorneys & Lawyers, Oakville
- Other Attorneys & Lawyers, Oakville
- Other Building Materials & Supplies, Oakville
- Other Electrical Products, Oakville
- Other Industrial Contractors, Oakville
- Other Lawyers & Attorneys, Oakville
- Outdoor Equipment & Accessories, Oakville
- Outdoor Furniture, Oakville
- Outerwear Stores, Oakville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Oakville - Outpatient Care
- Outsourcing Services, Oakville
- Overhead Door, Oakville
- Oxygen & Respiratory Equipment & Supplies, Oakville - Oxygen Concentrator, Tank, Machine, etc
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