- Obstetricians & Gynecologists, Frankfort - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Frankfort
- Occupational Health Care Professionals, Frankfort
- Occupational Therapy, Frankfort - Occupational Health Specialists
- Off Road Vehicles, Frankfort
- Off Road Vehicles Parts & Accessories, Frankfort
- Oil & Gas Companies, Frankfort
- Oil & Gas Consultants, Frankfort
- Oil & Petroleum Products, Frankfort - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Frankfort - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Frankfort - Oil Companies
- Ophthalmologists, Frankfort - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Frankfort
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- Opticians, Frankfort
- Optometrists, Frankfort - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Frankfort
- Ornamental Nursery, Frankfort
- Ornamental Nursery Services, Frankfort
- Orthopedic & Prosthetic Appliances & Shoes, Frankfort - Orthopedic Shoes
- Orthopedists, Frankfort - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Frankfort
- Other Building Materials & Supplies, Frankfort
- Outdoor & Lawn & Garden Equipment Repair & Service, Frankfort
- Outdoor Equipment & Accessories, Frankfort
- Outpatient Clinics, Frankfort - Care & Treatment Centers
- Oxygen & Respiratory Equipment & Supplies, Frankfort - Oxygen Concentrator, Tank, Machine, etc
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