- Occupational Health Care Professionals, Newton
- Occupational Therapy, Newton - Occupational Health Specialists
- Office Space on Rent, Newton - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Newton
- Oil Change & Lubrication, Newton - Auto Oil & Quick Lube
- Online Advertising, Newton - Internet Advertising
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Newton
- Opticians, Newton
- Optometrists, Newton - Eye Doctors, Physicians & Surgeons (Optometry)
- Organs Tuning & Repair, Newton
- Ornamental Nursery, Newton
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- Ornamental Nursery Services, Newton
- Orthodontist, Newton - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Newton - Orthopedic Shoes
- Orthotics and Prosthetics, Newton
- Other Building Materials & Supplies, Newton
- Other Electrical Products, Newton
- Other Industrial Goods, Newton
- Outdoor & Lawn & Garden Equipment Repair & Service, Newton
- Outdoor Equipment & Accessories, Newton
- Outdoor Furniture & Patio Furniture, Newton - Garden Furniture Stores
- Outplacement Consultants, Newton
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