- Obstetricians & Gynecologists, Lexington - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Lexington
- Occupational Therapy, Lexington - Occupational Health Specialists
- Office Buildings & Parks, Lexington
- Office Machinery, Lexington
- Office Planning & Design, Lexington
- Office Supplies, Equipment & Office Furniture Stores, Lexington
- Oil Industry & Oil Field Equipment & Services, Lexington - Oil Companies
- Oil Petroleum Wholesale, Lexington
- Online Advertising, Lexington - Internet Advertising
- Ophthalmic Goods, Lexington
- Ophthalmic Instruments & Machinery, Lexington
- Ophthalmologists, Lexington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lexington
- Opticians, Lexington
- Optometrists, Lexington - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Lexington
- Ornamental Nursery Services, Lexington
- Orthopedic & Prosthetic Appliances & Shoes, Lexington - Orthopedic Shoes
- Other Attorneys & Lawyers, Lexington
- Other Attorneys & Lawyers, Lexington
- Other Electrical Products, Lexington
- Other Lawyers & Attorneys, Lexington
- Other Lodging, Lexington
- Outplacement Consultants, Lexington
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