- Occupational Health Care Professionals, Fallon
- Occupational Therapy, Fallon - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Fallon
- Oil & Petroleum Products, Fallon - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Fallon - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Fallon - Oil Companies
- Optical Goods Repair & Service, Fallon - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fallon
- Optometrists, Fallon - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Fallon
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- Ornamental Nursery Products, Fallon
- Ornamental Nursery Services, Fallon
- Orthodontist, Fallon - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Fallon
- Other Lodging, Fallon
- Outdoor & Lawn & Garden Equipment Repair & Service, Fallon
- Outdoor Equipment & Accessories, Fallon
- Outpatient Services, Fallon - Outpatient Care
- Overhead Door, Fallon
- Oxygen & Respiratory Equipment & Supplies, Fallon - Oxygen Concentrator, Tank, Machine, etc
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