- Obstetricians & Gynecologists, Cambridge - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Cambridge
- Oil Change & Lubrication, Cambridge - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Cambridge
- Oil Industry & Oil Field Equipment & Services, Cambridge - Oil Companies
- Ophthalmologists, Cambridge - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Cambridge
- Optometrists, Cambridge - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Cambridge - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Cambridge
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- Ornamental Nursery Services, Cambridge
- Orthodontist, Cambridge - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Cambridge - Orthopedic Shoes
- Other Attorneys & Lawyers, Cambridge
- Other Attorneys & Lawyers, Cambridge
- Other Building Materials & Supplies, Cambridge
- Other Lawyers & Attorneys, Cambridge
- Outdoor & Lawn & Garden Equipment Repair & Service, Cambridge
- Oxygen & Respiratory Equipment & Supplies, Cambridge - Oxygen Concentrator, Tank, Machine, etc
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