- Office Supplies, Equipment & Office Furniture Stores, Vernon Rockville
- Oil Burners Services, Vernon Rockville
- Oil Change & Lubrication, Vernon Rockville - Auto Oil & Quick Lube
- Ophthalmologists, Vernon Rockville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Vernon Rockville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Vernon Rockville
- Opticians, Vernon Rockville
- Optometrists, Vernon Rockville - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Vernon Rockville - Dentists - Oral & Maxillofacial Surgeons
- Oriental Restaurants, Vernon Rockville
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- Ornamental Iron - Residential, Vernon Rockville - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Vernon Rockville - Steel, Iron, Bronze, etc
- Ornamental Nursery, Vernon Rockville
- Ornamental Nursery Products, Vernon Rockville
- Ornamental Nursery Services, Vernon Rockville
- Orthopedic & Prosthetic Appliances & Shoes, Vernon Rockville - Orthopedic Shoes
- Orthopedists, Vernon Rockville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Outdoor Equipment & Accessories, Vernon Rockville
- Outpatient Services, Vernon Rockville - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Vernon Rockville - Oxygen Concentrator, Tank, Machine, etc
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