- Office Supplies, Equipment & Office Furniture Stores, Staunton
- Oil & Gas Exploration & Development, Staunton - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Staunton - Companies
- Oil & Petroleum Products, Staunton - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Staunton - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Staunton - Oil Companies
- Old Age Homes Service, Staunton
- Ophthalmologists, Staunton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Staunton
- Opticians, Staunton
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- Optometrists, Staunton - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Staunton
- Ornamental Nursery Services, Staunton
- Osteoporosis Doctors, Staunton - Physicians & Surgeons
- Other Building Materials & Supplies, Staunton
- Other Electrical Products, Staunton
- Other Lodging, Staunton
- Outdoor & Lawn & Garden Equipment Repair & Service, Staunton
- Outdoor Equipment & Accessories, Staunton
- Outpatient Services, Staunton - Outpatient Care
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