- Obstetricians & Gynecologists, Middletown - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Middletown
- Off Road Vehicles Parts & Accessories, Middletown
- Office Buildings & Parks, Middletown
- Office Equipment & Supplies Manufacturers, Middletown
- Office Supplies, Equipment & Office Furniture Stores, Middletown
- Oil & Gas Companies, Middletown
- Oil & Petroleum Products, Middletown - Merchant, Wholesalers, etc
- Oil Burners Services, Middletown
- Oil Change & Lubrication, Middletown - Auto Oil & Quick Lube
- Ophthalmologists, Middletown - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Middletown
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Middletown
- Opticians, Middletown
- Optometrists, Middletown - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Middletown - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Middletown
- Ornamental Nursery, Middletown
- Ornamental Nursery Products, Middletown
- Ornamental Nursery Services, Middletown
- Orthodontist, Middletown - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Middletown - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Middletown
- Other Industrial Contractors, Middletown
- Outdoor & Lawn & Garden Equipment Repair & Service, Middletown
- Outdoor Equipment & Accessories, Middletown
- Outdoor Furniture & Patio Furniture, Middletown - Garden Furniture Stores
- Outpatient Clinics, Middletown - Care & Treatment Centers
- Outpatient Services, Middletown - Outpatient Care
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