- Occupational Health Care Professionals, Upland
- Occupational Therapy, Upland - Occupational Health Specialists
- Off Road Vehicles, Upland
- Off Road Vehicles Parts & Accessories, Upland
- Office Buildings & Parks, Upland
- Office Equipment & Supplies Manufacturers, Upland
- Office Supplies, Equipment & Office Furniture Stores, Upland
- Oil & Gas Companies, Upland
- Oil Change & Lubrication, Upland - Auto Oil & Quick Lube
- Oncologists, Upland - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Upland - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Upland
- Opticians, Upland
- Optometrists, Upland - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Upland - Dentists - Oral & Maxillofacial Surgeons
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- Orchard Equipment, Upland
- Ornamental Nursery, Upland
- Ornamental Nursery Services, Upland
- Orthodontist, Upland - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Upland - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Upland
- Other Attorneys & Lawyers, Upland
- Other Building Materials & Supplies, Upland
- Other Electrical Products, Upland
- Other Lawyers & Attorneys, Upland
- Outdoor & Lawn & Garden Equipment Repair & Service, Upland
- Outdoor Equipment & Accessories, Upland
- Outdoor Furniture & Patio Furniture, Upland - Garden Furniture Stores
- Outpatient Services, Upland - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Upland - Oxygen Concentrator, Tank, Machine, etc
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