- Office Planning & Design, Norco
- Office Supplies, Equipment & Office Furniture Stores, Norco
- Oil & Gas Companies, Norco
- Oil & Petroleum Products, Norco - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Norco - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Norco
- Optometrists, Norco - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Norco
- Ornamental Iron - Residential, Norco - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Norco - Steel, Iron, Bronze, etc
- Ornamental Nursery, Norco
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- Ornamental Nursery Products, Norco
- Ornamental Nursery Services, Norco
- Orthodontist, Norco - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Norco
- Orthopedic & Prosthetic Appliances & Shoes, Norco - Orthopedic Shoes
- Other Building Materials & Supplies, Norco
- Other Lodging, Norco
- Outdoor & Lawn & Garden Equipment Repair & Service, Norco
- Outdoor Equipment & Accessories, Norco
- Outpatient Services, Norco - Outpatient Care
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