- Off Road Vehicles, Platteville
- Off Road Vehicles Parts & Accessories, Platteville
- Office Supplies, Equipment & Office Furniture Stores, Platteville
- Oil Change & Lubrication, Platteville - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Platteville
- Opticians, Platteville
- Optometrists, Platteville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Platteville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Iron Work, Platteville
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- Ornamental Nursery, Platteville
- Ornamental Nursery Services, Platteville
- Orthodontist, Platteville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Platteville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Platteville
- Outdoor & Lawn & Garden Equipment Repair & Service, Platteville
- Outdoor Equipment & Accessories, Platteville
- Outdoor Furniture & Patio Furniture, Platteville - Garden Furniture Stores
- Overhead Door, Platteville
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