- Obstetricians & Gynecologists, Chantilly - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Chantilly
- Off Road Vehicles Parts & Accessories, Chantilly
- Office Supplies, Equipment & Office Furniture Stores, Chantilly
- Oil & Petroleum Products, Chantilly - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Chantilly - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Chantilly
- Opticians, Chantilly
- Optometrists, Chantilly - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Chantilly - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Chantilly
- Ornamental Nursery Services, Chantilly
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- Orthodontist, Chantilly - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Chantilly
- Other Attorneys & Lawyers, Chantilly
- Other Building Materials & Supplies, Chantilly
- Other Lawyers & Attorneys, Chantilly
- Outdoor & Lawn & Garden Equipment Repair & Service, Chantilly
- Outdoor Equipment & Accessories, Chantilly
- Outdoor Furniture, Chantilly
- Outdoor Furniture & Patio Furniture, Chantilly - Garden Furniture Stores
- Outsourcing Services, Chantilly
- Ownership Organizations, Chantilly
- Oxygen & Respiratory Equipment & Supplies, Chantilly - Oxygen Concentrator, Tank, Machine, etc
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