- Office Supplies, Equipment & Office Furniture Stores, New Windsor
- Oil & Petroleum Products, New Windsor - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, New Windsor - Oil Companies
- Oil Petroleum Wholesale, New Windsor
- Oilfield Trucking, New Windsor
- Oils Recycling, New Windsor
- Ophthalmologists, New Windsor - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opticians, New Windsor
- Optometrists, New Windsor - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, New Windsor - Dentists - Oral & Maxillofacial Surgeons
- Organ Donation & Tissue Banks, New Windsor
- Organizing Services & Products – Household & Business, New Windsor
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- Ornamental Nursery, New Windsor
- Ornamental Nursery Services, New Windsor
- Orthodontist, New Windsor - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, New Windsor - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, New Windsor
- Other Building Materials & Supplies, New Windsor
- Other Electrical Products, New Windsor
- Other Lodging, New Windsor
- Outdoor & Lawn & Garden Equipment Repair & Service, New Windsor
- Outdoor Equipment & Accessories, New Windsor
- Outdoor Furniture & Patio Furniture, New Windsor - Garden Furniture Stores
- Ownership Organizations, New Windsor
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