- Occupational Health Care Professionals, Bridgeville
- Occupational Therapy, Bridgeville - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Bridgeville
- Oil & Gas Well Drilling Services, Bridgeville
- Oil Change & Lubrication, Bridgeville - Auto Oil & Quick Lube
- Oil Field Services Testing Measuring & Surveying, Bridgeville
- Oil Industry & Oil Field Equipment & Services, Bridgeville - Oil Companies
- Old Age Homes Service, Bridgeville
- Ophthalmologists, Bridgeville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Bridgeville
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Bridgeville
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- Opticians, Bridgeville
- Optometrists, Bridgeville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Bridgeville
- Ornamental Nursery Services, Bridgeville
- Other Building Materials & Supplies, Bridgeville
- Outdoor & Lawn & Garden Equipment Repair & Service, Bridgeville
- Outdoor Equipment & Accessories, Bridgeville
- Outdoor Furniture & Patio Furniture, Bridgeville - Garden Furniture Stores
- Outerwear & Accessories Manufacturers, Bridgeville
- Oxygen & Respiratory Equipment & Supplies, Bridgeville - Oxygen Concentrator, Tank, Machine, etc
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