- Obstetricians & Gynecologists, Ashland - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Ashland
- Occupational Health Care Professionals, Ashland
- Office Supplies, Equipment & Office Furniture Stores, Ashland
- Oil Change & Lubrication, Ashland - Auto Oil & Quick Lube
- Ophthalmic Goods, Ashland
- Ophthalmologists, Ashland - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ashland
- Optometrists, Ashland - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Ashland
- Ornamental Greenhouses, Ashland
- Ornamental Nursery, Ashland
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- Ornamental Nursery Services, Ashland
- Orthopedists, Ashland - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Ashland
- Other Attorneys & Lawyers, Ashland
- Other Attorneys & Lawyers, Ashland
- Other Building Materials & Supplies, Ashland
- Other Lawyers & Attorneys, Ashland
- Outdoor Advertising & Billboard, Ashland
- Outdoor Equipment & Accessories, Ashland
- Outpatient Services, Ashland - Outpatient Care
- Overhead Door, Ashland
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