- Obstetricians & Gynecologists, Northridge - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Equipment & Supplies Manufacturers, Northridge
- Office Supplies, Equipment & Office Furniture Stores, Northridge
- Oil & Gas Companies, Northridge
- Oil & Gas Producers, Northridge - Companies
- Oil Change & Lubrication, Northridge - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Northridge - Oil Companies
- Oil Petroleum Wholesale, Northridge
- Old Age Homes Service, Northridge
- Ophthalmologists, Northridge - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Northridge - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Northridge
- Opticians, Northridge
- Optometrists, Northridge - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Northridge - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Northridge
- Orchid Growers, Northridge
- Oriental Goods & Products Stores, Northridge
- Ornamental Iron - Residential, Northridge - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Iron Work, Northridge
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- Ornamental Metal Work, Northridge - Steel, Iron, Bronze, etc
- Ornamental Nursery, Northridge
- Ornamental Nursery Services, Northridge
- Orthodontist, Northridge - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Northridge
- Orthopedic & Prosthetic Appliances & Shoes, Northridge - Orthopedic Shoes
- Orthopedists, Northridge - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Northridge
- Other Attorneys & Lawyers, Northridge
- Other Attorneys & Lawyers, Northridge
- Other Building Materials & Supplies, Northridge
- Other Electrical Products, Northridge
- Other Lawyers & Attorneys, Northridge
- Outdoor & Lawn & Garden Equipment Repair & Service, Northridge
- Outdoor Equipment & Accessories, Northridge
- Outdoor Furniture & Patio Furniture, Northridge - Garden Furniture Stores
- Outerwear Stores, Northridge - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Northridge - Outpatient Care
- Ownership Organizations, Northridge
- Oxygen & Respiratory Equipment & Supplies, Northridge - Oxygen Concentrator, Tank, Machine, etc
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