- Oil & Grease Seals, Van Wert
- Oil Change & Lubrication, Van Wert - Auto Oil & Quick Lube
- Ophthalmologists, Van Wert - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Van Wert
- Optometrists, Van Wert - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Van Wert - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Van Wert
- Ornamental Nursery, Van Wert
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- Ornamental Nursery Products, Van Wert
- Ornamental Nursery Services, Van Wert
- Orthodontist, Van Wert - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Van Wert - Orthopedic Shoes
- Orthopedists, Van Wert - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Van Wert
- Otolaryngologists, Van Wert - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outpatient Services, Van Wert - Outpatient Care
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