- Obstetricians & Gynecologists, Herndon - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Herndon
- Occupational Therapy, Herndon - Occupational Health Specialists
- Office Buildings & Parks, Herndon
- Office Space on Rent, Herndon - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Herndon
- Oil Change & Lubrication, Herndon - Auto Oil & Quick Lube
- Ophthalmologists, Herndon - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opinion Analysis & Research, Herndon
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Herndon
- Opticians, Herndon
- Optometrists, Herndon - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Consultants, Herndon
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- Ornamental Nursery, Herndon
- Ornamental Nursery Services, Herndon
- Orthodontist, Herndon - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Herndon - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Herndon
- Other Attorneys & Lawyers, Herndon
- Other Building Materials & Supplies, Herndon
- Other Lawyers & Attorneys, Herndon
- Outdoor & Lawn & Garden Equipment Repair & Service, Herndon
- Outdoor Equipment & Accessories, Herndon
- Outdoor Furniture, Herndon
- Outdoor Furniture & Patio Furniture, Herndon - Garden Furniture Stores
- Ownership Organizations, Herndon
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