- Occupational Health Care Professionals, Huntsville
- Occupational Therapy, Huntsville - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Huntsville
- Oil Change & Lubrication, Huntsville - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Huntsville
- Opticians, Huntsville
- Optometrists, Huntsville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Huntsville - Eye Clinics
- Ornamental Nursery, Huntsville
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- Ornamental Nursery Services, Huntsville
- Orthopedic & Prosthetic Appliances & Shoes, Huntsville - Orthopedic Shoes
- Other Building Materials & Supplies, Huntsville
- Other Lodging, Huntsville
- Outdoor Advertising & Billboard, Huntsville
- Outdoor Equipment & Accessories, Huntsville
- Outpatient Services, Huntsville - Outpatient Care
- Overhead Door, Huntsville
- Oxygen & Respiratory Equipment & Supplies, Huntsville - Oxygen Concentrator, Tank, Machine, etc
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