- Obstetricians & Gynecologists, Somersworth - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Somersworth
- Occupational Health Care Physicians & Surgeons, Somersworth - Occupational Medicine
- Occupational Health Care Professionals, Somersworth
- Occupational Therapy, Somersworth - Occupational Health Specialists
- Office Buildings & Parks, Somersworth
- Office Supplies, Equipment & Office Furniture Stores, Somersworth
- Oil & Petroleum Products, Somersworth - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Somersworth - Auto Oil & Quick Lube
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- Ophthalmologists, Somersworth - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Somersworth
- Optometrists, Somersworth - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Somersworth - Dentists - Oral & Maxillofacial Surgeons
- Orthopedic & Prosthetic Appliances & Shoes, Somersworth - Orthopedic Shoes
- Orthopedists, Somersworth - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Somersworth
- Other Building Materials & Supplies, Somersworth
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