- Office Buildings & Parks, Annandale
- Office Furniture & Equipment Repair & Refinish, Annandale
- Office Supplies, Equipment & Office Furniture Stores, Annandale
- Office Systems Designer & Consultants, Annandale
- Oil Change & Lubrication, Annandale - Auto Oil & Quick Lube
- Ophthalmologists, Annandale - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Annandale - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Annandale
- Opticians, Annandale
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- Optometrists, Annandale - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Annandale
- Ornamental Nursery Services, Annandale
- Orthopedists, Annandale - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Annandale
- Other Specialties, Annandale - Doctors, Physicians & Surgeons
- Outdoor Equipment & Accessories, Annandale
- Outdoor Furniture & Patio Furniture, Annandale - Garden Furniture Stores
- Outpatient Services, Annandale - Outpatient Care
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