- Obstetricians & Gynecologists, Hummelstown - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Hummelstown
- Oil Change & Lubrication, Hummelstown - Auto Oil & Quick Lube
- Optical Goods Manufacturers, Hummelstown
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hummelstown
- Optometrists, Hummelstown - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Hummelstown
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