- Office Equipment & Supplies Manufacturers, Smithfield
- Office Supplies, Equipment & Office Furniture Stores, Smithfield
- Oil Brokers, Smithfield
- Oil Burners Services, Smithfield
- Oil Industry & Oil Field Equipment & Services, Smithfield - Oil Companies
- Ophthalmic Goods, Smithfield
- Optical Goods Manufacturers, Smithfield
- Optical Instruments & Lenses Manufacturers, Smithfield
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Smithfield
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- Optometrists, Smithfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Other Building Materials & Supplies, Smithfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Smithfield
- Outdoor Equipment & Accessories, Smithfield
- Outerwear & Accessories Manufacturers, Smithfield
- Outpatient Clinics, Smithfield - Care & Treatment Centers
- Outpatient Services, Smithfield - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Smithfield - Oxygen Concentrator, Tank, Machine, etc
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