- Obstetricians & Gynecologists, Clearfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Clearfield
- Oil Change & Lubrication, Clearfield - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Clearfield
- Optometrists, Clearfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Clearfield - Eye Clinics
- Oral Surgeon, Clearfield - Dentists - Oral & Maxillofacial Surgeons
- Oriental Goods & Products Stores, Clearfield
- Ornamental Greenhouses, Clearfield
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- Ornamental Nursery, Clearfield
- Ornamental Nursery Services, Clearfield
- Orthodontist, Clearfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Clearfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Clearfield
- Other Lodging, Clearfield
- Outboard Motors, Clearfield
- Outdoor Equipment & Accessories, Clearfield
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