- Obstetricians & Gynecologists, Harrisonburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Harrisonburg
- Occupational Therapy, Harrisonburg - Occupational Health Specialists
- Off Road Vehicles, Harrisonburg
- Off Road Vehicles Parts & Accessories, Harrisonburg
- Office & Meeting Equipment & Supplies Rental, Harrisonburg
- Office Furniture & Equipment Rental & Leasing, Harrisonburg
- Office Furniture & Equipment Repair & Refinish, Harrisonburg
- Office Planning & Design, Harrisonburg
- Office Supplies, Equipment & Office Furniture Stores, Harrisonburg
- Oil & Petroleum Products, Harrisonburg - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Harrisonburg - Auto Oil & Quick Lube
- Oil Field Contractors, Harrisonburg
- Oil Industry & Oil Field Equipment & Services, Harrisonburg - Oil Companies
- Old Age Homes Service, Harrisonburg
- Open Door Church, Harrisonburg
- Ophthalmologists, Harrisonburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Harrisonburg
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- Opticians, Harrisonburg
- Optometrists, Harrisonburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Harrisonburg - Dentists - Oral & Maxillofacial Surgeons
- Organs Tuning & Repair, Harrisonburg
- Oriental Goods & Products Stores, Harrisonburg
- Oriental Restaurants, Harrisonburg
- Ornamental Nursery, Harrisonburg
- Ornamental Nursery Services, Harrisonburg
- Orthodontist, Harrisonburg - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Harrisonburg
- Other Attorneys & Lawyers, Harrisonburg
- Other Building Materials & Supplies, Harrisonburg
- Other Lawyers & Attorneys, Harrisonburg
- Other Lodging, Harrisonburg
- Outdoor & Lawn & Garden Equipment Repair & Service, Harrisonburg
- Outdoor Equipment & Accessories, Harrisonburg
- Overhead Door, Harrisonburg
- Oxygen & Respiratory Equipment & Supplies, Harrisonburg - Oxygen Concentrator, Tank, Machine, etc
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