- Obstetricians & Gynecologists, West Hills - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, West Hills
- Oil & Gas Producers, West Hills - Companies
- Oil & Petroleum Products, West Hills - Merchant, Wholesalers, etc
- Old Age Homes Service, West Hills
- Oncologists, West Hills - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, West Hills - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, West Hills
- Opticians, West Hills
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- Optometrists, West Hills - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, West Hills
- Ornamental Nursery Services, West Hills
- Orthopedic & Prosthetic Appliances & Shoes, West Hills - Orthopedic Shoes
- Orthopedists, West Hills - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, West Hills
- Outdoor & Lawn & Garden Equipment Repair & Service, West Hills
- Outdoor Equipment & Accessories, West Hills
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