- Occupational Health & Safety, Logansport
- Occupational Health Care Professionals, Logansport
- Office Supplies, Equipment & Office Furniture Stores, Logansport
- Oil & Gas Companies, Logansport
- Oil Industry & Oil Field Equipment & Services, Logansport - Oil Companies
- Oil Petroleum Wholesale, Logansport
- Optical Goods Manufacturers, Logansport
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Logansport
- Optometrists, Logansport - Eye Doctors, Physicians & Surgeons (Optometry)
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