- Obstetricians & Gynecologists, Gettysburg - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office & Meeting Equipment & Supplies Rental, Gettysburg
- Office Furniture & Equipment Rental & Leasing, Gettysburg
- Office Supplies, Equipment & Office Furniture Stores, Gettysburg
- Oil & Gas Producers, Gettysburg - Companies
- Oncologists, Gettysburg - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Gettysburg - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Gettysburg - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Gettysburg
- Opticians, Gettysburg
- Optometrists, Gettysburg - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Gettysburg - Eye Clinics
- Oral Surgeon, Gettysburg - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Gettysburg
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- Ornamental Nursery, Gettysburg
- Ornamental Nursery Services, Gettysburg
- Orthodontist, Gettysburg - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Gettysburg - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Gettysburg
- Other Lodging, Gettysburg
- Outdoor & Lawn & Garden Equipment Repair & Service, Gettysburg
- Outdoor Advertising & Billboard, Gettysburg
- Outdoor Equipment & Accessories, Gettysburg
- Outerwear Stores, Gettysburg - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outsourcing Services, Gettysburg
- Overhead Door, Gettysburg
- Oxygen & Respiratory Equipment & Supplies, Gettysburg - Oxygen Concentrator, Tank, Machine, etc
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