- Obstetricians & Gynecologists, Springfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Springfield
- Occupational Rehabilitation, Springfield
- Oil Change & Lubrication, Springfield - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Springfield
- Opticians, Springfield
- Optometrists, Springfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Springfield - Eye Clinics
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