- Obstetricians & Gynecologists, Huntington Station - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Huntington Station
- Occupational Therapy, Huntington Station - Occupational Health Specialists
- Off Road Vehicles, Huntington Station
- Off Road Vehicles Parts & Accessories, Huntington Station
- Office Supplies, Equipment & Office Furniture Stores, Huntington Station
- Oil & Gas Producers, Huntington Station - Companies
- Oil & Petroleum Products, Huntington Station - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Huntington Station - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Huntington Station - Oil Companies
- Oil Petroleum Wholesale, Huntington Station
- Oils & Greases, Huntington Station
- Ophthalmologists, Huntington Station - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Huntington Station
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- Opticians, Huntington Station
- Optometrists, Huntington Station - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Huntington Station
- Ornamental Nursery, Huntington Station
- Ornamental Nursery Services, Huntington Station
- Orthodontist, Huntington Station - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Huntington Station - Orthopedic Shoes
- Orthopedists, Huntington Station - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Huntington Station
- Other Building Materials & Supplies, Huntington Station
- Outdoor & Lawn & Garden Equipment Repair & Service, Huntington Station
- Outdoor Equipment & Accessories, Huntington Station
- Outerwear Stores, Huntington Station - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Huntington Station - Outpatient Care
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