- Obstetricians & Gynecologists, Waynesville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Waynesville - Occupational Medicine
- Occupational Health Care Professionals, Waynesville
- Occupational Medicine Doctors, Waynesville - Physicians & Surgeons
- Office Buildings & Parks, Waynesville
- Office Supplies, Equipment & Office Furniture Stores, Waynesville
- Oil & Petroleum Products, Waynesville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Waynesville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Waynesville - Oil Companies
- Oil Petroleum Wholesale, Waynesville
- Open Door Church, Waynesville
- Ophthalmologists, Waynesville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Waynesville
- Opticians, Waynesville
- Optometrists, Waynesville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Waynesville - Dentists - Oral & Maxillofacial Surgeons
- Oriental Rugs, Waynesville
- Ornamental Greenhouses, Waynesville
- Ornamental Nursery, Waynesville
- Ornamental Nursery Services, Waynesville
- Orthopedists, Waynesville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Waynesville
- Other Electrical Products, Waynesville
- Other Lodging, Waynesville
- Outboard Motors, Waynesville
- Outdoor & Lawn & Garden Equipment Repair & Service, Waynesville
- Outdoor Equipment & Accessories, Waynesville
- Outdoor Furniture & Patio Furniture, Waynesville - Garden Furniture Stores
- Outpatient Services, Waynesville - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Waynesville - Oxygen Concentrator, Tank, Machine, etc
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