- Obstetricians & Gynecologists, Fairfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Fairfield
- Occupational Therapy, Fairfield - Occupational Health Specialists
- Office Buildings & Parks, Fairfield
- Office Furniture & Equipment Repair & Refinish, Fairfield
- Office Partitions & Dividers, Fairfield
- Office Supplies, Equipment & Office Furniture Stores, Fairfield
- Oil & Petroleum Products, Fairfield - Merchant, Wholesalers, etc
- Oil Burners Services, Fairfield
- Oil Change & Lubrication, Fairfield - Auto Oil & Quick Lube
- Ophthalmologists, Fairfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Fairfield - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fairfield
- Opticians, Fairfield
- Optometrists, Fairfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Fairfield - Eye Clinics
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- Oral Surgeon, Fairfield - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Fairfield
- Ornamental Nursery Services, Fairfield
- Orthodontist, Fairfield - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Synagogues, Fairfield
- Orthopedists, Fairfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Fairfield - Physicians & Surgeons
- Other Building Materials & Supplies, Fairfield
- Other Electrical Products, Fairfield
- Other Office Supply Stores, Fairfield
- Other Specialties, Fairfield - Doctors, Physicians & Surgeons
- Outdoor & Lawn & Garden Equipment Repair & Service, Fairfield
- Outdoor Equipment & Accessories, Fairfield
- Outpatient Clinics, Fairfield - Care & Treatment Centers
- Outpatient Services, Fairfield - Outpatient Care
- Ownership Organizations, Fairfield
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