- Office Supplies, Equipment & Office Furniture Stores, Miller Place
- Oil & Gas Exploration & Development, Miller Place - Oil Field Exploration, Monitoring & Remediation
- Oil Industry & Oil Field Equipment & Services, Miller Place - Oil Companies
- Oil Petroleum Wholesale, Miller Place
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Miller Place
- Opticians, Miller Place
- Optometrists, Miller Place - Eye Doctors, Physicians & Surgeons (Optometry)
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- Organizing Services & Products – Household & Business, Miller Place
- Ornamental Nursery, Miller Place
- Ornamental Nursery Services, Miller Place
- Orthodontist, Miller Place - Teeth Straightening, Invisalign & Dental Braces
- Outdoor & Lawn & Garden Equipment Repair & Service, Miller Place
- Outdoor Equipment & Accessories, Miller Place
- Outerwear Stores, Miller Place - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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