- Oil & Petroleum Products, East Haven - Merchant, Wholesalers, etc
- Oil Burners Services, East Haven
- Oil Change & Lubrication, East Haven - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, East Haven
- Opticians, East Haven
- Optometrists, East Haven - Eye Doctors, Physicians & Surgeons (Optometry)
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- Orthodontist, East Haven - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, East Haven
- Other Industrial Goods, East Haven
- Outerwear Stores, East Haven - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, East Haven - Outpatient Care
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