- Off Road Vehicles, Acton
- Off Road Vehicles Parts & Accessories, Acton
- Office Supplies, Equipment & Office Furniture Stores, Acton
- Oil Burners Services, Acton
- Oil Change & Lubrication, Acton - Auto Oil & Quick Lube
- Ophthalmic Goods, Acton
- Ophthalmic Instruments & Machinery, Acton
- Ophthalmologists, Acton - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Acton
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Acton
- Opticians, Acton
- Optometrists, Acton - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Acton - Eye Clinics
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- Ornamental Nursery, Acton
- Ornamental Nursery Services, Acton
- Orthodontist, Acton - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Acton
- Other Attorneys & Lawyers, Acton
- Other Building Materials & Supplies, Acton
- Other Electrical Products, Acton
- Other Lawyers & Attorneys, Acton
- Outdoor & Lawn & Garden Equipment Repair & Service, Acton
- Outdoor Equipment & Accessories, Acton
- Outdoor Furniture & Patio Furniture, Acton - Garden Furniture Stores
- Oxygen & Respiratory Equipment & Supplies, Acton - Oxygen Concentrator, Tank, Machine, etc
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