- Obstetricians & Gynecologists, Gastonia - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Gastonia - Occupational Medicine
- Occupational Health Care Professionals, Gastonia
- Occupational Therapy, Gastonia - Occupational Health Specialists
- Office Equipment & Supplies Manufacturers, Gastonia
- Office Supplies, Equipment & Office Furniture Stores, Gastonia
- Oil Change & Lubrication, Gastonia - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Gastonia - Oil Companies
- Oil Petroleum Wholesale, Gastonia
- Oils Industrial, Gastonia
- Oncologists, Gastonia - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Gastonia - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Gastonia
- Opticians, Gastonia
- Optometrists, Gastonia - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Gastonia - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Gastonia
- Ornamental Nursery Products, Gastonia
- Ornamental Nursery Services, Gastonia
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- Orthodontist, Gastonia - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Gastonia - Orthopedic Shoes
- Orthopedic Shoes, Gastonia
- Orthopedists, Gastonia - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Gastonia
- Other Attorneys & Lawyers, Gastonia
- Other Attorneys & Lawyers, Gastonia
- Other Building Materials & Supplies, Gastonia
- Other Electrical Products, Gastonia
- Other Lawyers & Attorneys, Gastonia
- Outdoor & Lawn & Garden Equipment Repair & Service, Gastonia
- Outdoor Advertising & Billboard, Gastonia
- Outdoor Equipment & Accessories, Gastonia
- Outdoor Furniture & Patio Furniture, Gastonia - Garden Furniture Stores
- Outerwear Stores, Gastonia - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Gastonia - Outpatient Care
- Overhead Door, Gastonia
- Ownership Organizations, Gastonia
- Oxygen & Respiratory Equipment & Supplies, Gastonia - Oxygen Concentrator, Tank, Machine, etc
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