- Office Supplies, Equipment & Office Furniture Stores, Nixa
- Oil & Gas Companies, Nixa
- Oil & Gas Well Drilling Services, Nixa
- Oil Industry & Oil Field Equipment & Services, Nixa - Oil Companies
- Ophthalmologists, Nixa - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Nixa
- Opticians, Nixa
- Optometrists, Nixa - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Nixa
- Ornamental Nursery Services, Nixa
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- Orthodontist, Nixa - Teeth Straightening, Invisalign & Dental Braces
- Osteoporosis Doctors, Nixa - Physicians & Surgeons
- Other Building Materials & Supplies, Nixa
- Outdoor & Lawn & Garden Equipment Repair & Service, Nixa
- Outdoor Advertising & Billboard, Nixa
- Outdoor Equipment & Accessories, Nixa
- Outdoor Furniture, Nixa
- Outdoor Furniture & Patio Furniture, Nixa - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Nixa - Oxygen Concentrator, Tank, Machine, etc
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