- Obstetricians & Gynecologists, Falls Church - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Falls Church
- Occupational Therapy, Falls Church - Occupational Health Specialists
- Office Buildings & Parks, Falls Church
- Office Planning & Design, Falls Church
- Office Supplies, Equipment & Office Furniture Stores, Falls Church
- Oil & Gas Additives & Supplies, Falls Church
- Oil Change & Lubrication, Falls Church - Auto Oil & Quick Lube
- Oncologists, Falls Church - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Falls Church - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Falls Church - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Falls Church
- Opticians, Falls Church
- Optometrists, Falls Church - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Falls Church - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Falls Church
- Organizing Services & Products – Household & Business, Falls Church
- Oriental Goods & Products Stores, Falls Church
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- Oriental Restaurants, Falls Church
- Ornamental Nursery, Falls Church
- Ornamental Nursery Services, Falls Church
- Orthodontist, Falls Church - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Falls Church
- Orthopedic Shoes, Falls Church
- Orthopedists, Falls Church - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Falls Church
- Other Attorneys & Lawyers, Falls Church
- Other Building Materials & Supplies, Falls Church
- Other Lawyers & Attorneys, Falls Church
- Other Lodging, Falls Church
- Outdoor & Lawn & Garden Equipment Repair & Service, Falls Church
- Outdoor Equipment & Accessories, Falls Church
- Outpatient Clinics, Falls Church - Care & Treatment Centers
- Outpatient Services, Falls Church - Outpatient Care
- Outsourcing Services, Falls Church
- Oxygen & Respiratory Equipment & Supplies, Falls Church - Oxygen Concentrator, Tank, Machine, etc
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