- Obstetricians & Gynecologists, Hamtramck - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Oil & Petroleum Products, Hamtramck - Merchant, Wholesalers, etc
- Oil Industry & Oil Field Equipment & Services, Hamtramck - Oil Companies
- Oils Industrial, Hamtramck
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hamtramck
- Optometrists, Hamtramck - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Hamtramck
- Ornamental Nursery Services, Hamtramck
- Orthodox Churches, Hamtramck
- Orthopedists, Hamtramck - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Hamtramck
- Outerwear Stores, Hamtramck - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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