- Obstetricians & Gynecologists, Newton - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Newton
- Oil Change & Lubrication, Newton - Auto Oil & Quick Lube
- Ophthalmologists, Newton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Newton
- Opticians, Newton
- Optometrists, Newton - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Newton - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Newton
- Ornamental Greenhouses, Newton
- Ornamental Nursery, Newton
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- Ornamental Nursery Services, Newton
- Orthodontist, Newton - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Newton - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Newton
- Other Attorneys & Lawyers, Newton
- Other Building Materials & Supplies, Newton
- Other Lawyers & Attorneys, Newton
- Other Lodging, Newton
- Outdoor & Lawn & Garden Equipment Repair & Service, Newton
- Outdoor Equipment & Accessories, Newton
- Outpatient Services, Newton - Outpatient Care
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