- Obstetricians & Gynecologists, San Gabriel - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, San Gabriel
- Oil Change & Lubrication, San Gabriel - Auto Oil & Quick Lube
- Ophthalmic Goods, San Gabriel
- Ophthalmic Instruments & Machinery, San Gabriel
- Optical Goods Manufacturers, San Gabriel
- Optical Stores - Eyeglasses, Lenses & Sunglasses, San Gabriel
- Optometrists, San Gabriel - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, San Gabriel
- Oriental Restaurants, San Gabriel
- Ornamental Nursery, San Gabriel
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- Ornamental Nursery Services, San Gabriel
- Orthodox Churches, San Gabriel
- Orthopedic & Prosthetic Appliances & Shoes, San Gabriel - Orthopedic Shoes
- Orthopedists, San Gabriel - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, San Gabriel
- Other Attorneys & Lawyers, San Gabriel
- Other Building Materials & Supplies, San Gabriel
- Other Lawyers & Attorneys, San Gabriel
- Outdoor & Lawn & Garden Equipment Repair & Service, San Gabriel
- Outdoor Equipment & Accessories, San Gabriel
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