- Obstetricians & Gynecologists, Charlottetown - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Charlottetown
- Occupational Health Care Professionals, Charlottetown
- Occupational Therapy, Charlottetown - Occupational Health Specialists
- Oceanographic Services, Charlottetown
- Office & Meeting Equipment & Supplies Rental, Charlottetown
- Office Buildings & Parks, Charlottetown
- Office Furniture & Equipment Rental & Leasing, Charlottetown
- Office Space on Rent, Charlottetown - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Charlottetown
- Oil & Gas Companies, Charlottetown
- Oil Change & Lubrication, Charlottetown - Auto Oil & Quick Lube
- Ophthalmologists, Charlottetown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Charlottetown
- Opticians, Charlottetown
- Optometrists, Charlottetown - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Charlottetown
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- Ornamental Nursery, Charlottetown
- Ornamental Nursery Products, Charlottetown
- Ornamental Nursery Services, Charlottetown
- Orthopedic & Prosthetic Appliances & Shoes, Charlottetown - Orthopedic Shoes
- Orthopedic Appliances, Charlottetown
- Orthopedists, Charlottetown - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Charlottetown
- Other Attorneys & Lawyers, Charlottetown
- Other Building Materials & Supplies, Charlottetown
- Other Industrial Goods, Charlottetown
- Other Lawyers & Attorneys, Charlottetown
- Other Lodging, Charlottetown
- Outboard Motors, Charlottetown
- Outdoor Advertising & Billboard, Charlottetown
- Outdoor Equipment & Accessories, Charlottetown
- Overhead Door, Charlottetown
- Oxygen & Respiratory Equipment & Supplies, Charlottetown - Oxygen Concentrator, Tank, Machine, etc
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