- Off Road Vehicles, Mocksville
- Off Road Vehicles Parts & Accessories, Mocksville
- Office Supplies, Equipment & Office Furniture Stores, Mocksville
- Oil & Gas Companies, Mocksville
- Oil Change & Lubrication, Mocksville - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Mocksville
- Optometrists, Mocksville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Iron - Residential, Mocksville - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
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- Ornamental Metal Work, Mocksville - Steel, Iron, Bronze, etc
- Ornamental Nursery, Mocksville
- Ornamental Nursery Products, Mocksville
- Ornamental Nursery Services, Mocksville
- Other Building Materials & Supplies, Mocksville
- Outdoor & Lawn & Garden Equipment Repair & Service, Mocksville
- Oxygen & Respiratory Equipment & Supplies, Mocksville - Oxygen Concentrator, Tank, Machine, etc
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