- Office Supplies, Equipment & Office Furniture Stores, Onalaska
- Oil Change & Lubrication, Onalaska - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Onalaska
- Oil Industry & Oil Field Equipment & Services, Onalaska - Oil Companies
- Oils Recycling, Onalaska
- Optometrists, Onalaska - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Onalaska - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Onalaska
- Ornamental Nursery Services, Onalaska
- Orthodontist, Onalaska - Teeth Straightening, Invisalign & Dental Braces
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- Orthopedic & Prosthetic Appliances & Shoes, Onalaska - Orthopedic Shoes
- Orthopedic Appliances, Onalaska
- Orthopedic Shoes, Onalaska
- Orthotics and Prosthetics, Onalaska
- Other Building Materials & Supplies, Onalaska
- Other Lodging, Onalaska
- Other Office Supply Stores, Onalaska
- Outdoor & Lawn & Garden Equipment Repair & Service, Onalaska
- Outdoor Equipment & Accessories, Onalaska
- Oxygen & Respiratory Equipment & Supplies, Onalaska - Oxygen Concentrator, Tank, Machine, etc
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