- Occupational Health & Safety, Pineville
- Occupational Health Care Professionals, Pineville
- Office Supplies, Equipment & Office Furniture Stores, Pineville
- Oil & Gas Exploration & Development, Pineville - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Producers, Pineville - Companies
- Oil & Petroleum Products, Pineville - Merchant, Wholesalers, etc
- Oil And Petroleum Products, Pineville
- Oil Change & Lubrication, Pineville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Pineville - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Pineville
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- Opticians, Pineville
- Optometrists, Pineville - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Pineville
- Ornamental Nursery, Pineville
- Ornamental Nursery Services, Pineville
- Other Building Materials & Supplies, Pineville
- Outdoor & Lawn & Garden Equipment Repair & Service, Pineville
- Outdoor Furniture & Patio Furniture, Pineville - Garden Furniture Stores
- Outpatient Services, Pineville - Outpatient Care
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