- Occupational Health Care Professionals, Port Clinton
- Occupational Therapy, Port Clinton - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Port Clinton
- Oil Change & Lubrication, Port Clinton - Auto Oil & Quick Lube
- Oncologists, Port Clinton - Cancer Doctors, Physicians & Surgeons (Oncology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Port Clinton
- Opticians, Port Clinton
- Optometrists, Port Clinton - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Port Clinton
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