- Obstetricians & Gynecologists, Allen Park - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Allen Park
- Occupational Health Care Professionals, Allen Park
- Office Supplies, Equipment & Office Furniture Stores, Allen Park
- Oil & Gas Companies, Allen Park
- Oil Change & Lubrication, Allen Park - Auto Oil & Quick Lube
- Optical Goods Repair & Service, Allen Park - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Allen Park
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