- Occupational Health Care Professionals, Courtenay
- Occupational Therapy, Courtenay - Occupational Health Specialists
- Office Space on Rent, Courtenay - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Courtenay
- Office Wall Units, Courtenay
- Oil & Gas Companies, Courtenay
- Oil Change & Lubrication, Courtenay - Auto Oil & Quick Lube
- Oil Field Installation, Courtenay
- Oil Industry & Oil Field Equipment & Services, Courtenay - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Courtenay
- Opticians, Courtenay
- Optometrists, Courtenay - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Courtenay
- Ornamental Nursery Services, Courtenay
- Orthopedic & Prosthetic Appliances & Shoes, Courtenay - Orthopedic Shoes
- Other Building Materials & Supplies, Courtenay
- Other Industrial Contractors, Courtenay
- Other Lodging, Courtenay
- Outboard Motors, Courtenay
- Outdoor & Lawn & Garden Equipment Repair & Service, Courtenay
- Outdoor Advertising & Billboard, Courtenay
- Outdoor Equipment & Accessories, Courtenay
- Outdoor Furniture, Courtenay
- Overhead Door, Courtenay
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