- Obstetricians & Gynecologists, Frankenmuth - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Frankenmuth
- Oil Change & Lubrication, Frankenmuth - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Frankenmuth - Oil Companies
- Oil Petroleum Wholesale, Frankenmuth
- Ophthalmologists, Frankenmuth - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Frankenmuth
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