- Off Track Betting, Hauppauge
- Office Space on Rent, Hauppauge - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Hauppauge
- Oil Burners Services, Hauppauge
- Ophthalmic Goods, Hauppauge
- Ophthalmic Instruments & Machinery, Hauppauge
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hauppauge
- Opticians, Hauppauge
- Optometrists, Hauppauge - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Hauppauge - Dentists - Oral & Maxillofacial Surgeons
- Organizing Services & Products – Household & Business, Hauppauge
- Ornamental Nursery, Hauppauge
- Ornamental Nursery Services, Hauppauge
- Orthodontist, Hauppauge - Teeth Straightening, Invisalign & Dental Braces
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- Orthotics and Prosthetics, Hauppauge
- Other Attorneys & Lawyers, Hauppauge
- Other Attorneys & Lawyers, Hauppauge
- Other Building Materials & Supplies, Hauppauge
- Other Electrical Products, Hauppauge
- Other Industrial Goods, Hauppauge
- Other Lawyers & Attorneys, Hauppauge
- Other Lodging, Hauppauge
- Outdoor & Lawn & Garden Equipment Repair & Service, Hauppauge
- Outdoor Equipment & Accessories, Hauppauge
- Outerwear & Accessories Manufacturers, Hauppauge
- Outpatient Services, Hauppauge - Outpatient Care
- Outplacement Consultants, Hauppauge
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