- Obstetricians & Gynecologists, Southington - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Southington
- Oil Change & Lubrication, Southington - Auto Oil & Quick Lube
- Ophthalmologists, Southington - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Southington - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Southington
- Opticians, Southington
- Optometrists, Southington - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Southington - Dentists - Oral & Maxillofacial Surgeons
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