- Occupational Health & Safety, Madison
- Occupational Health Care Professionals, Madison
- Off Road Vehicles, Madison
- Off Road Vehicles Parts & Accessories, Madison
- Office Buildings & Parks, Madison
- Office Supplies, Equipment & Office Furniture Stores, Madison
- Oil Change & Lubrication, Madison - Auto Oil & Quick Lube
- Ophthalmologists, Madison - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Madison
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Madison
- Opticians, Madison
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- Optometrists, Madison - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Madison - Eye Clinics
- Oral Surgeon, Madison - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Madison
- Ornamental Nursery Services, Madison
- Orthodontist, Madison - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Madison
- Outdoor Centers, Madison
- Outdoor Power Equipment, Madison
- Oxygen & Respiratory Equipment & Supplies, Madison - Oxygen Concentrator, Tank, Machine, etc
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