- Obstetricians & Gynecologists, Fairfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Fairfield
- Occupational Health Care Professionals, Fairfield
- Off Road Vehicles, Fairfield
- Off Road Vehicles Parts & Accessories, Fairfield
- Office Planning & Design, Fairfield
- Office Supplies, Equipment & Office Furniture Stores, Fairfield
- Oil & Gas Additives & Supplies, Fairfield
- Oil Change & Lubrication, Fairfield - Auto Oil & Quick Lube
- Old Age Homes Service, Fairfield
- Oncologists, Fairfield - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Fairfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fairfield
- Opticians, Fairfield
- Optometrists, Fairfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Fairfield - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Metal Work, Fairfield - Steel, Iron, Bronze, etc
- Ornamental Nursery, Fairfield
- Ornamental Nursery Services, Fairfield
- Orthodontist, Fairfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Fairfield - Orthopedic Shoes
- Orthopedists, Fairfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Fairfield
- Outdoor Equipment & Accessories, Fairfield
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