- Office Machinery, Londonderry
- Office Space on Rent, Londonderry - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Londonderry
- Oil Burners Services, Londonderry
- Oil Change & Lubrication, Londonderry - Auto Oil & Quick Lube
- Ophthalmologists, Londonderry - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Londonderry
- Opticians, Londonderry
- Optometrists, Londonderry - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Londonderry
- Ornamental Greenhouses, Londonderry
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- Ornamental Nursery, Londonderry
- Ornamental Nursery Services, Londonderry
- Orthodontist, Londonderry - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Londonderry - Orthopedic Shoes
- Orthopedists, Londonderry - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Londonderry
- Other Attorneys & Lawyers, Londonderry
- Other Building Materials & Supplies, Londonderry
- Other Lawyers & Attorneys, Londonderry
- Outdoor Equipment & Accessories, Londonderry
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