- Occupational Health & Safety, Girard
- Occupational Health Care Professionals, Girard
- Office Supplies, Equipment & Office Furniture Stores, Girard
- Oil Change & Lubrication, Girard - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Girard - Oil Companies
- Oilfield Trucking, Girard
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Girard
- Optometrists, Girard - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Girard
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- Ornamental Nursery, Girard
- Ornamental Nursery Services, Girard
- Orthopedic Shoes, Girard
- Other Building Materials & Supplies, Girard
- Other Electrical Products, Girard
- Outdoor Advertising & Billboard, Girard
- Outpatient Clinics, Girard - Care & Treatment Centers
- Outpatient Services, Girard - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Girard - Oxygen Concentrator, Tank, Machine, etc
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