- Occupational Health Care Professionals, Buford
- Occupational Therapy, Buford - Occupational Health Specialists
- Office Buildings & Parks, Buford
- Office Supplies, Equipment & Office Furniture Stores, Buford
- Oil & Gas Companies, Buford
- Oil & Gas Exploration & Development, Buford - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Buford - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Buford - Oil Companies
- Old Age Homes Service, Buford
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Buford
- Opticians, Buford
- Optometrists, Buford - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Buford - Eye Clinics
- Oral Surgeon, Buford - Dentists - Oral & Maxillofacial Surgeons
- Oriental Restaurants, Buford
- Ornamental Nursery, Buford
- Ornamental Nursery Services, Buford
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- Orthodontist, Buford - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Buford - Orthopedic Shoes
- Orthopedic Shoes, Buford
- Orthopedists, Buford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Buford
- Other Electrical Products, Buford
- Other Specialties, Buford - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Buford
- Outdoor Advertising & Billboard, Buford
- Outdoor Centers, Buford
- Outdoor Equipment & Accessories, Buford
- Outdoor Furniture & Patio Furniture, Buford - Garden Furniture Stores
- Outdoor Power Equipment, Buford
- Outerwear Stores, Buford - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Buford - Outpatient Care
- Outsourcing Services, Buford
- Ownership Organizations, Buford
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