- Obstetricians & Gynecologists, Lexington - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Lexington
- Occupational Health Care Professionals, Lexington
- Occupational Therapy, Lexington - Occupational Health Specialists
- Off Road Vehicles, Lexington
- Off Road Vehicles Parts & Accessories, Lexington
- Office Supplies, Equipment & Office Furniture Stores, Lexington
- Oil And Petroleum Products, Lexington
- Oil Change & Lubrication, Lexington - Auto Oil & Quick Lube
- Ophthalmologists, Lexington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lexington
- Opticians, Lexington
- Optometrists, Lexington - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Lexington - Eye Clinics
- Oral Surgeon, Lexington - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Lexington
- Ornamental Nursery Services, Lexington
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- Orthodontist, Lexington - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Lexington
- Orthopedists, Lexington - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Lexington
- Other Attorneys & Lawyers, Lexington
- Other Building Materials & Supplies, Lexington
- Other Industrial Contractors, Lexington
- Other Lawyers & Attorneys, Lexington
- Outboard Motors, Lexington
- Outboard Motors Parts & Repair, Lexington
- Outdoor & Lawn & Garden Equipment Repair & Service, Lexington
- Outdoor Advertising & Billboard, Lexington
- Outdoor Equipment & Accessories, Lexington
- Outdoor Furniture & Patio Furniture, Lexington - Garden Furniture Stores
- Outpatient Services, Lexington - Outpatient Care
- Ownership Organizations, Lexington
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