- Obstetricians & Gynecologists, Northport - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Equipment & Supplies Manufacturers, Northport
- Office Supplies, Equipment & Office Furniture Stores, Northport
- Oil & Gas Exploration & Development, Northport - Oil Field Exploration, Monitoring & Remediation
- Oil & Gas Land Leases Properties & Royalties, Northport
- Oil & Gas Producers, Northport - Companies
- Oil & Gas Well Drilling Services, Northport
- Oil Change & Lubrication, Northport - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Northport - Oil Companies
- Optical Goods Repair & Service, Northport - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Northport
- Optometrists, Northport - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Metal Work, Northport - Steel, Iron, Bronze, etc
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- Ornamental Nursery, Northport
- Ornamental Nursery Services, Northport
- Orthopedic & Prosthetic Appliances & Shoes, Northport - Orthopedic Shoes
- Orthopedists, Northport - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Northport
- Other Building Materials & Supplies, Northport
- Other Lodging, Northport
- Outboard Motors Parts & Repair, Northport
- Outdoor & Lawn & Garden Equipment Repair & Service, Northport
- Outdoor Equipment & Accessories, Northport
- Outerwear Stores, Northport - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Northport - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Northport - Oxygen Concentrator, Tank, Machine, etc
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