- Office Supplies, Equipment & Office Furniture Stores, Nelson
- Oil Change & Lubrication, Nelson - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Nelson - Oil Companies
- Oilfield Trucking, Nelson
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Nelson
- Opticians, Nelson
- Optometrists, Nelson - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Nelson
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- Ornamental Nursery, Nelson
- Ornamental Nursery Services, Nelson
- Orthopedic & Prosthetic Appliances & Shoes, Nelson - Orthopedic Shoes
- Other Building Materials & Supplies, Nelson
- Other Lodging, Nelson
- Outdoor & Lawn & Garden Equipment Repair & Service, Nelson
- Outerwear Stores, Nelson - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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