- Office Supplies, Equipment & Office Furniture Stores, Sylmar
- Oil Change & Lubrication, Sylmar - Auto Oil & Quick Lube
- Ophthalmic Goods, Sylmar
- Ophthalmic Instruments & Machinery, Sylmar
- Ophthalmologists, Sylmar - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Sylmar
- Opticians, Sylmar
- Optometrists, Sylmar - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Iron - Residential, Sylmar - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Iron Work, Sylmar
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- Ornamental Metal Work, Sylmar - Steel, Iron, Bronze, etc
- Ornamental Nursery, Sylmar
- Ornamental Nursery Services, Sylmar
- Orthopedic & Prosthetic Appliances & Shoes, Sylmar - Orthopedic Shoes
- Other Building Materials & Supplies, Sylmar
- Other Lodging, Sylmar
- Outdoor & Lawn & Garden Equipment Repair & Service, Sylmar
- Outdoor Equipment & Accessories, Sylmar
- Outdoor Furniture, Sylmar
- Outdoor Furniture & Patio Furniture, Sylmar - Garden Furniture Stores
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