- Office Supplies, Equipment & Office Furniture Stores, Bellefonte
- Oil & Gas Exploration & Development, Bellefonte - Oil Field Exploration, Monitoring & Remediation
- Oil Industry & Oil Field Equipment & Services, Bellefonte - Oil Companies
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Bellefonte
- Optometrists, Bellefonte - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Bellefonte
- Ornamental Nursery, Bellefonte
- Ornamental Nursery Products, Bellefonte
- Ornamental Nursery Services, Bellefonte
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- Orthodontist, Bellefonte - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Bellefonte - Orthopedic Shoes
- Orthopedists, Bellefonte - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Bellefonte
- Other Building Materials & Supplies, Bellefonte
- Other Electrical Products, Bellefonte
- Other Lodging, Bellefonte
- Outdoor & Lawn & Garden Equipment Repair & Service, Bellefonte
- Outdoor Equipment & Accessories, Bellefonte
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