- Obstetricians & Gynecologists, Fairmont - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Fairmont
- Off Road Vehicles Parts & Accessories, Fairmont
- Office Supplies, Equipment & Office Furniture Stores, Fairmont
- Oil & Gas Companies, Fairmont
- Oil Field Services Mud Disposal & Jacking, Fairmont
- Oil Industry & Oil Field Equipment & Services, Fairmont - Oil Companies
- Oil Seeds, Fairmont
- Ophthalmologists, Fairmont - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fairmont
- Optometrists, Fairmont - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Fairmont - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Fairmont
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- Ornamental Greenhouses, Fairmont
- Ornamental Nursery, Fairmont
- Ornamental Nursery Products, Fairmont
- Ornamental Nursery Services, Fairmont
- Orthodontist, Fairmont - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Fairmont - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Fairmont
- Other Industrial Contractors, Fairmont
- Other Lodging, Fairmont
- Outdoor & Lawn & Garden Equipment Repair & Service, Fairmont
- Outdoor Equipment & Accessories, Fairmont
- Outpatient Services, Fairmont - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Fairmont - Oxygen Concentrator, Tank, Machine, etc
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