- Obstetricians & Gynecologists, Louisville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Louisville
- Occupational Therapy, Louisville - Occupational Health Specialists
- Office Equipment & Supplies Manufacturers, Louisville
- Office Machinery, Louisville
- Office Supplies, Equipment & Office Furniture Stores, Louisville
- Oil Change & Lubrication, Louisville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Louisville - Oil Companies
- Ophthalmologists, Louisville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Louisville
- Opticians, Louisville
- Optometrists, Louisville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Louisville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Louisville
- Ornamental Nursery, Louisville
- Ornamental Nursery Services, Louisville
- Orthodontist, Louisville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Louisville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Louisville
- Outdoor Equipment & Accessories, Louisville
- Outdoor Furniture & Patio Furniture, Louisville - Garden Furniture Stores
- Ownership Organizations, Louisville
- Oxygen & Respiratory Equipment & Supplies, Louisville - Oxygen Concentrator, Tank, Machine, etc
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