- Obstetricians & Gynecologists, Ellisville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Ellisville
- Occupational Therapy, Ellisville - Occupational Health Specialists
- Oil Change & Lubrication, Ellisville - Auto Oil & Quick Lube
- Oil Field Supplies Rental, Ellisville
- Oil Industry & Oil Field Equipment & Services, Ellisville - Oil Companies
- Oil Well Casing & Pulling, Ellisville
- Oil Well Equipment & Supplies, Ellisville
- Oilfield Trucking, Ellisville
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Ellisville
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- Optometrists, Ellisville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Ellisville - Eye Clinics
- Ornamental Nursery, Ellisville
- Ornamental Nursery Services, Ellisville
- Orthodontist, Ellisville - Teeth Straightening, Invisalign & Dental Braces
- Outboard Motors Parts & Repair, Ellisville
- Outdoor Advertising & Billboard, Ellisville
- Outdoor Equipment & Accessories, Ellisville
- Outpatient Services, Ellisville - Outpatient Care
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