- Occupational Health & Safety, City of Industry
- Occupational Health Care Professionals, City of Industry
- Occupational Medicine Doctors, City of Industry - Physicians & Surgeons
- Office Buildings & Parks, City of Industry
- Office Supplies, Equipment & Office Furniture Stores, City of Industry
- Oil & Gas Producers, City of Industry - Companies
- Oil & Petroleum Products, City of Industry - Merchant, Wholesalers, etc
- Oil Change & Lubrication, City of Industry - Auto Oil & Quick Lube
- Oil Extraction Downhole, City of Industry
- Oil Industry & Oil Field Equipment & Services, City of Industry - Oil Companies
- Oncologists, City of Industry - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmic Goods, City of Industry
- Ophthalmic Goods - Manufacturers, City of Industry
- Ophthalmic Instruments & Machinery, City of Industry
- Ophthalmologists, City of Industry - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, City of Industry
- Optical Instruments & Lenses Manufacturers, City of Industry
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, City of Industry
- Opticians, City of Industry
- Optometrists, City of Industry - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, City of Industry
- Ornamental Nursery Services, City of Industry
- Orthodontist, City of Industry - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, City of Industry - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, City of Industry
- Other Attorneys & Lawyers, City of Industry
- Other Building Materials & Supplies, City of Industry
- Other Electrical Products, City of Industry
- Other Lawyers & Attorneys, City of Industry
- Other Lodging, City of Industry
- Outdoor Equipment & Accessories, City of Industry
- Outdoor Furniture, City of Industry
- Outerwear Stores, City of Industry - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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