- Obstetricians & Gynecologists, Clearfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Furniture & Equipment Repair & Refinish, Clearfield
- Office Supplies, Equipment & Office Furniture Stores, Clearfield
- Oil & Gas Exploration & Development, Clearfield - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Well Drilling Services, Clearfield
- Oil & Petroleum Products, Clearfield - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Clearfield - Oil Companies
- Ophthalmologists, Clearfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Clearfield
- Opticians, Clearfield
- Optometrists, Clearfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Clearfield - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Clearfield
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- Ornamental Nursery, Clearfield
- Ornamental Nursery Services, Clearfield
- Orthodontist, Clearfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Clearfield - Orthopedic Shoes
- Osteoporosis Doctors, Clearfield - Physicians & Surgeons
- Other Attorneys & Lawyers, Clearfield
- Other Attorneys & Lawyers, Clearfield
- Other Building Materials & Supplies, Clearfield
- Other Lawyers & Attorneys, Clearfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Clearfield
- Outdoor Equipment & Accessories, Clearfield
- Outdoor Furniture & Patio Furniture, Clearfield - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Clearfield - Oxygen Concentrator, Tank, Machine, etc
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