- Office Buildings & Parks, Duarte
- Office Supplies, Equipment & Office Furniture Stores, Duarte
- Oil & Gas Additives & Supplies, Duarte
- Oil & Petroleum Products, Duarte - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Duarte - Auto Oil & Quick Lube
- Opera Companies, Duarte
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Duarte
- Optometrists, Duarte - Eye Doctors, Physicians & Surgeons (Optometry)
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