- Obstetricians & Gynecologists, Washington Court House - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Washington Court House - Occupational Medicine
- Occupational Health Care Professionals, Washington Court House
- Office Supplies, Equipment & Office Furniture Stores, Washington Court House
- Oil & Gas Companies, Washington Court House
- Oil Change & Lubrication, Washington Court House - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Washington Court House - Oil Companies
- Oils Industrial, Washington Court House
- Ophthalmologists, Washington Court House - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Washington Court House
- Optometrists, Washington Court House - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Greenhouses, Washington Court House
- Ornamental Nursery, Washington Court House
- Ornamental Nursery Products, Washington Court House
- Ornamental Nursery Services, Washington Court House
- Orthodontist, Washington Court House - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Washington Court House
- Other Lodging, Washington Court House
- Other Office Supply Stores, Washington Court House
- Outdoor Equipment & Accessories, Washington Court House
- Outpatient Services, Washington Court House - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Washington Court House - Oxygen Concentrator, Tank, Machine, etc
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