- Occupational Health & Safety, Nicholasville
- Occupational Health Care Professionals, Nicholasville
- Off Road Vehicles, Nicholasville
- Off Road Vehicles Parts & Accessories, Nicholasville
- Office Supplies, Equipment & Office Furniture Stores, Nicholasville
- Oil & Petroleum Products, Nicholasville - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Nicholasville - Auto Oil & Quick Lube
- Optical Goods Repair & Service, Nicholasville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Nicholasville
- Opticians, Nicholasville
- Optometrists, Nicholasville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Nicholasville - Eye Clinics
- Oral Surgeon, Nicholasville - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Nicholasville
- Ornamental Greenhouses, Nicholasville
- Ornamental Nursery, Nicholasville
- Ornamental Nursery Services, Nicholasville
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- Orthodontist, Nicholasville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Nicholasville - Orthopedic Shoes
- Orthotics and Prosthetics, Nicholasville
- Other Attorneys & Lawyers, Nicholasville
- Other Attorneys & Lawyers, Nicholasville
- Other Building Materials & Supplies, Nicholasville
- Other Lawyers & Attorneys, Nicholasville
- Other Lodging, Nicholasville
- Other Office Supply Stores, Nicholasville
- Outboard Motors, Nicholasville
- Outdoor & Lawn & Garden Equipment Repair & Service, Nicholasville
- Outdoor Centers, Nicholasville
- Outdoor Power Equipment, Nicholasville
- Outdoor Power Equipment Repair, Nicholasville
- Outerwear Stores, Nicholasville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Oxygen & Respiratory Equipment & Supplies, Nicholasville - Oxygen Concentrator, Tank, Machine, etc
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