- Obstetricians & Gynecologists, Charles Town - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Charles Town
- Oil & Petroleum Products, Charles Town - Merchant, Wholesalers, etc
- Oil Burners Services, Charles Town
- Oil Change & Lubrication, Charles Town - Auto Oil & Quick Lube
- Ophthalmologists, Charles Town - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Charles Town
- Opticians, Charles Town
- Optometrists, Charles Town - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Charles Town
- Ornamental Nursery Services, Charles Town
- Orthodontist, Charles Town - Teeth Straightening, Invisalign & Dental Braces
- Other Lodging, Charles Town
- Outdoor Advertising & Billboard, Charles Town
- Outdoor Equipment & Accessories, Charles Town
- Outpatient Services, Charles Town - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Charles Town - Oxygen Concentrator, Tank, Machine, etc
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