- Office Supplies, Equipment & Office Furniture Stores, Vandalia
- Oil & Gas Well Drilling Services, Vandalia
- Oil Change & Lubrication, Vandalia - Auto Oil & Quick Lube
- Oil Field Contractors, Vandalia
- Oil Industry & Oil Field Equipment & Services, Vandalia - Oil Companies
- Ophthalmologists, Vandalia - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Vandalia
- Optometrists, Vandalia - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Vandalia
- Ornamental Nursery Services, Vandalia
- Orthopedists, Vandalia - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Vandalia
- Outdoor & Lawn & Garden Equipment Repair & Service, Vandalia
- Outdoor Equipment & Accessories, Vandalia
- Outpatient Services, Vandalia - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Vandalia - Oxygen Concentrator, Tank, Machine, etc
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