- Occupational Health Care Professionals, Campbell
- Occupational Therapy, Campbell - Occupational Health Specialists
- Office Buildings & Parks, Campbell
- Office Supplies, Equipment & Office Furniture Stores, Campbell
- Office Wall Units, Campbell
- Oil & Gas Companies, Campbell
- Oil & Petroleum Products, Campbell - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Campbell - Auto Oil & Quick Lube
- Oncologists, Campbell - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Campbell - Internet Advertising
- Ophthalmologists, Campbell - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Campbell
- Opticians, Campbell
- Optometrists, Campbell - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Campbell
- Oriental Restaurants, Campbell
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- Ornamental Iron - Residential, Campbell - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Campbell - Steel, Iron, Bronze, etc
- Ornamental Nursery, Campbell
- Ornamental Nursery Services, Campbell
- Orthopedic & Prosthetic Appliances & Shoes, Campbell - Orthopedic Shoes
- Other Attorneys & Lawyers, Campbell
- Other Attorneys & Lawyers, Campbell
- Other Building Materials & Supplies, Campbell
- Other Lawyers & Attorneys, Campbell
- Other Lodging, Campbell
- Outdoor & Lawn & Garden Equipment Repair & Service, Campbell
- Outdoor Equipment & Accessories, Campbell
- Outdoor Furniture, Campbell
- Outdoor Furniture & Patio Furniture, Campbell - Garden Furniture Stores
- Outpatient Services, Campbell - Outpatient Care
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