- Obstetricians & Gynecologists, Clemmons - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Buildings & Parks, Clemmons
- Office Supplies, Equipment & Office Furniture Stores, Clemmons
- Oil Change & Lubrication, Clemmons - Auto Oil & Quick Lube
- Oil Extraction Downhole, Clemmons
- Oil Industry & Oil Field Equipment & Services, Clemmons - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Clemmons
- Optometrists, Clemmons - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Clemmons
- Ornamental Nursery Services, Clemmons
- Orthodontist, Clemmons - Teeth Straightening, Invisalign & Dental Braces
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- Orthopedic & Prosthetic Appliances & Shoes, Clemmons - Orthopedic Shoes
- Orthopedic Shoes, Clemmons
- Other Attorneys & Lawyers, Clemmons
- Other Attorneys & Lawyers, Clemmons
- Other Building Materials & Supplies, Clemmons
- Other Lawyers & Attorneys, Clemmons
- Otolaryngologists, Clemmons - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, Clemmons
- Outdoor Equipment & Accessories, Clemmons
- Outdoor Furniture & Patio Furniture, Clemmons - Garden Furniture Stores
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