- Obstetricians & Gynecologists, Kirksville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Kirksville
- Oil & Gas Companies, Kirksville
- Oil Change & Lubrication, Kirksville - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Kirksville
- Oil Industry & Oil Field Equipment & Services, Kirksville - Oil Companies
- Oncologists, Kirksville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Kirksville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Kirksville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Kirksville
- Opticians, Kirksville
- Optometrists, Kirksville - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Kirksville - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Kirksville
- Ornamental Nursery Services, Kirksville
- Orthopedic & Prosthetic Appliances & Shoes, Kirksville - Orthopedic Shoes
- Orthopedists, Kirksville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Kirksville
- Osteoporosis Doctors, Kirksville - Physicians & Surgeons
- Other Building Materials & Supplies, Kirksville
- Other Lodging, Kirksville
- Outpatient Services, Kirksville - Outpatient Care
- Overhead Door, Kirksville
- Oxygen & Respiratory Equipment & Supplies, Kirksville - Oxygen Concentrator, Tank, Machine, etc
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