- Obstetricians & Gynecologists, Vandalia - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Vandalia
- Oil And Petroleum Products, Vandalia
- Oil Change & Lubrication, Vandalia - Auto Oil & Quick Lube
- Open Bible Church, Vandalia
- Opticians, Vandalia
- Optometrists, Vandalia - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Vandalia
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- Ornamental Nursery Services, Vandalia
- Orthodontist, Vandalia - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Vandalia - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Vandalia - Physicians & Surgeons
- Other Building Materials & Supplies, Vandalia
- Outdoor Equipment & Accessories, Vandalia
- Outpatient Clinics, Vandalia - Care & Treatment Centers
- Outpatient Services, Vandalia - Outpatient Care
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