- Off Road Vehicles, Beloit
- Off Road Vehicles Parts & Accessories, Beloit
- Office Supplies, Equipment & Office Furniture Stores, Beloit
- Oil & Gas Companies, Beloit
- Oil Change & Lubrication, Beloit - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Beloit
- Optometrists, Beloit - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Greenhouses, Beloit
- Ornamental Nursery, Beloit
- Ornamental Nursery Products, Beloit
- Ornamental Nursery Services, Beloit
- Other Building Materials & Supplies, Beloit
- Outdoor & Lawn & Garden Equipment Repair & Service, Beloit
- Oxygen & Respiratory Equipment & Supplies, Beloit - Oxygen Concentrator, Tank, Machine, etc
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