- Occupational Health Care Professionals, Port Jefferson Station
- Occupational Therapy, Port Jefferson Station - Occupational Health Specialists
- Off Road Vehicles, Port Jefferson Station
- Off Road Vehicles Parts & Accessories, Port Jefferson Station
- Office & Meeting Equipment & Supplies Rental, Port Jefferson Station
- Office Supplies, Equipment & Office Furniture Stores, Port Jefferson Station
- Oil Change & Lubrication, Port Jefferson Station - Auto Oil & Quick Lube
- Ophthalmologists, Port Jefferson Station - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Port Jefferson Station
- Opticians, Port Jefferson Station
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- Optometrists, Port Jefferson Station - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Port Jefferson Station - Dentists - Oral & Maxillofacial Surgeons
- Orthodontist, Port Jefferson Station - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Port Jefferson Station
- Other Lodging, Port Jefferson Station
- Outdoor & Lawn & Garden Equipment Repair & Service, Port Jefferson Station
- Outdoor Centers, Port Jefferson Station
- Outdoor Equipment & Accessories, Port Jefferson Station
- Outdoor Power Equipment, Port Jefferson Station
- Outpatient Services, Port Jefferson Station - Outpatient Care
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