- Obstetricians & Gynecologists, Commack - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Track Betting, Commack
- Office Buildings & Parks, Commack
- Office Supplies, Equipment & Office Furniture Stores, Commack
- Oil Change & Lubrication, Commack - Auto Oil & Quick Lube
- Oncologists, Commack - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Commack - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Commack - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Commack
- Opticians, Commack
- Optometrists, Commack - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Commack - Eye Clinics
- Oral Surgeon, Commack - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Commack
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- Ornamental Nursery, Commack
- Ornamental Nursery Services, Commack
- Orthodontist, Commack - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic Shoes, Commack
- Orthopedists, Commack - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Commack
- Other Attorneys & Lawyers, Commack
- Other Attorneys & Lawyers, Commack
- Other Building Materials & Supplies, Commack
- Other Lawyers & Attorneys, Commack
- Outdoor & Lawn & Garden Equipment Repair & Service, Commack
- Outdoor Equipment & Accessories, Commack
- Outpatient Clinics, Commack - Care & Treatment Centers
- Outplacement Consultants, Commack
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