- Obstetricians & Gynecologists, Hicksville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Hicksville
- Oil Burners Services, Hicksville
- Oil Change & Lubrication, Hicksville - Auto Oil & Quick Lube
- Ophthalmologists, Hicksville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hicksville
- Opticians, Hicksville
- Optometrists, Hicksville - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Hicksville
- Ornamental Greenhouses, Hicksville
- Ornamental Nursery, Hicksville
- Ornamental Nursery Services, Hicksville
- Orthodontist, Hicksville - Teeth Straightening, Invisalign & Dental Braces
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- Orthopedic & Prosthetic Appliances & Shoes, Hicksville - Orthopedic Shoes
- Orthopedists, Hicksville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Hicksville
- Other Attorneys & Lawyers, Hicksville
- Other Attorneys & Lawyers, Hicksville
- Other Building Materials & Supplies, Hicksville
- Other Electrical Products, Hicksville
- Other Lawyers & Attorneys, Hicksville
- Other Lodging, Hicksville
- Other Office Supply Stores, Hicksville
- Outdoor & Lawn & Garden Equipment Repair & Service, Hicksville
- Outdoor Equipment & Accessories, Hicksville
- Outerwear Stores, Hicksville - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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