- Office Supplies, Equipment & Office Furniture Stores, New Milford
- Oil & Petroleum Products, New Milford - Merchant, Wholesalers, etc
- Oil Burners Services, New Milford
- Oil Change & Lubrication, New Milford - Auto Oil & Quick Lube
- Ophthalmologists, New Milford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opticians, New Milford
- Optometrists, New Milford - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, New Milford - Dentists - Oral & Maxillofacial Surgeons
- Oriental Restaurants, New Milford
- Ornamental Nursery, New Milford
- Ornamental Nursery Products, New Milford
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- Ornamental Nursery Services, New Milford
- Orthopedic & Prosthetic Appliances & Shoes, New Milford - Orthopedic Shoes
- Orthopedists, New Milford - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, New Milford
- Other Attorneys & Lawyers, New Milford
- Other Building Materials & Supplies, New Milford
- Other Industrial Contractors, New Milford
- Other Lawyers & Attorneys, New Milford
- Other Lodging, New Milford
- Outdoor & Lawn & Garden Equipment Repair & Service, New Milford
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