- Obstetricians & Gynecologists, Defiance - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Defiance
- Occupational Therapy, Defiance - Occupational Health Specialists
- Office Supplies, Equipment & Office Furniture Stores, Defiance
- Oil Change & Lubrication, Defiance - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Defiance - Oil Companies
- Oncologists, Defiance - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Defiance - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Defiance
- Opticians, Defiance
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- Optometrists, Defiance - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Defiance - Eye Clinics
- Oral Surgeon, Defiance - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Defiance
- Ornamental Nursery, Defiance
- Ornamental Nursery Services, Defiance
- Orthodontist, Defiance - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Defiance - Orthopedic Shoes
- Other Building Materials & Supplies, Defiance
- Outdoor Equipment & Accessories, Defiance
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