- Obstetricians & Gynecologists, Fullerton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Fullerton
- Occupational Therapy, Fullerton - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Fullerton
- Oil & Gas Companies, Fullerton
- Oil Change & Lubrication, Fullerton - Auto Oil & Quick Lube
- Opera Companies, Fullerton
- Ophthalmologists, Fullerton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Fullerton
- Optical Goods Repair & Service, Fullerton - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Fullerton
- Opticians, Fullerton
- Optometrists, Fullerton - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Fullerton - Eye Clinics
- Organizing Services & Products – Household & Business, Fullerton
- Ornamental Iron - Residential, Fullerton - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Iron Work, Fullerton
- Ornamental Metal Work, Fullerton - Steel, Iron, Bronze, etc
- Ornamental Nursery, Fullerton
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- Ornamental Nursery Services, Fullerton
- Orthodontist, Fullerton - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Fullerton - Orthopedic Shoes
- Orthopedic Appliances, Fullerton
- Orthopedists, Fullerton - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Fullerton
- Other Attorneys & Lawyers, Fullerton
- Other Attorneys & Lawyers, Fullerton
- Other Building Materials & Supplies, Fullerton
- Other Lawyers & Attorneys, Fullerton
- Other Lodging, Fullerton
- Other Office Supply Stores, Fullerton
- Outdoor & Lawn & Garden Equipment Repair & Service, Fullerton
- Outdoor Equipment & Accessories, Fullerton
- Outerwear Stores, Fullerton - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Overhead Door, Fullerton
- Ownership Organizations, Fullerton
- Oxygen & Respiratory Equipment & Supplies, Fullerton - Oxygen Concentrator, Tank, Machine, etc
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