- Occupational Health Care Professionals, Penticton
- Occupational Rehabilitation, Penticton
- Occupational Therapy, Penticton - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Penticton
- Oil & Gas Companies, Penticton
- Oil & Petroleum Products, Penticton - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Penticton - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Penticton
- Optometrists, Penticton - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Penticton - Eye Clinics
- Ornamental Nursery, Penticton
- Ornamental Nursery Products, Penticton
- Ornamental Nursery Services, Penticton
- Orthodontist, Penticton - Teeth Straightening, Invisalign & Dental Braces
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- Orthopedic & Prosthetic Appliances & Shoes, Penticton - Orthopedic Shoes
- Orthopedic Shoes, Penticton
- Orthopedists, Penticton - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Penticton
- Other Electrical Products, Penticton
- Other Lodging, Penticton
- Other Office Supply Stores, Penticton
- Outboard Motors, Penticton
- Outdoor & Lawn & Garden Equipment Repair & Service, Penticton
- Outdoor Equipment & Accessories, Penticton
- Outdoor Furniture, Penticton
- Overhead Door, Penticton
- Ownership Organizations, Penticton
- Oxygen & Respiratory Equipment & Supplies, Penticton - Oxygen Concentrator, Tank, Machine, etc
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