- Off Road Vehicles, Merrill
- Off Road Vehicles Parts & Accessories, Merrill
- Office Supplies, Equipment & Office Furniture Stores, Merrill
- Oil Change & Lubrication, Merrill - Auto Oil & Quick Lube
- Ophthalmologists, Merrill - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Merrill - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Merrill
- Optometrists, Merrill - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Merrill
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- Ornamental Nursery, Merrill
- Ornamental Nursery Services, Merrill
- Orthodontist, Merrill - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Merrill - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Merrill
- Other Lodging, Merrill
- Outdoor & Lawn & Garden Equipment Repair & Service, Merrill
- Oxygen & Respiratory Equipment & Supplies, Merrill - Oxygen Concentrator, Tank, Machine, etc
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