- Obstetricians & Gynecologists, Hillsboro - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Hillsboro
- Oil Industry & Oil Field Equipment & Services, Hillsboro - Oil Companies
- Oil Petroleum Wholesale, Hillsboro
- Ophthalmologists, Hillsboro - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hillsboro
- Optometrists, Hillsboro - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Hillsboro
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- Ornamental Nursery Services, Hillsboro
- Orthopedic & Prosthetic Appliances & Shoes, Hillsboro - Orthopedic Shoes
- Other Building Materials & Supplies, Hillsboro
- Other Lodging, Hillsboro
- Outdoor & Lawn & Garden Equipment Repair & Service, Hillsboro
- Outdoor Equipment & Accessories, Hillsboro
- Outdoor Furniture & Patio Furniture, Hillsboro - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Hillsboro - Oxygen Concentrator, Tank, Machine, etc
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