- Obstetricians & Gynecologists, Fairfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Fairfield
- Oil & Gas Companies, Fairfield
- Oil Change & Lubrication, Fairfield - Auto Oil & Quick Lube
- Old Age Homes Service, Fairfield
- Online Advertising, Fairfield - Internet Advertising
- 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
- Oral Surgeon, Fairfield - Dentists - Oral & Maxillofacial Surgeons
- Oriental Goods & Products Stores, Fairfield
- Oriental Rugs, Fairfield
- Ornamental Iron - Residential, Fairfield - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Fairfield - Steel, Iron, Bronze, etc
- Ornamental Nursery, Fairfield
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- Ornamental Nursery Services, Fairfield
- Orthodontist, Fairfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Fairfield - Orthopedic Shoes
- Orthopedic Shoes, Fairfield
- Other Attorneys & Lawyers, Fairfield
- Other Attorneys & Lawyers, Fairfield
- Other Building Materials & Supplies, Fairfield
- Other Industrial Contractors, Fairfield
- Other Lawyers & Attorneys, Fairfield
- Other Lodging, Fairfield
- Other Office Supply Stores, Fairfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Fairfield
- Outdoor Equipment & Accessories, Fairfield
- Outdoor Furniture & Patio Furniture, Fairfield - Garden Furniture Stores
- Outerwear Stores, Fairfield - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Clinics, Fairfield - Care & Treatment Centers
- Outpatient Services, Fairfield - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Fairfield - Oxygen Concentrator, Tank, Machine, etc
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