- Occupational Health Care Professionals, Moorhead
- Occupational Rehabilitation, Moorhead
- Office Supplies, Equipment & Office Furniture Stores, Moorhead
- Oil & Gas Companies, Moorhead
- Oil Change & Lubrication, Moorhead - Auto Oil & Quick Lube
- Ophthalmologists, Moorhead - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Moorhead
- Opticians, Moorhead
- Optometrists, Moorhead - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Moorhead
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- Ornamental Nursery Products, Moorhead
- Ornamental Nursery Services, Moorhead
- Other Attorneys & Lawyers, Moorhead
- Other Attorneys & Lawyers, Moorhead
- Other Building Materials & Supplies, Moorhead
- Other Lawyers & Attorneys, Moorhead
- Outboard Motors, Moorhead
- Outdoor & Lawn & Garden Equipment Repair & Service, Moorhead
- Outdoor Equipment & Accessories, Moorhead
- Outdoor Furniture & Patio Furniture, Moorhead - Garden Furniture Stores
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