- Obstetricians & Gynecologists, Urbana - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Urbana
- Occupational Therapy, Urbana - Occupational Health Specialists
- Oil Change & Lubrication, Urbana - Auto Oil & Quick Lube
- Ophthalmologists, Urbana - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Urbana
- Optometrists, Urbana - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Urbana
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- Ornamental Nursery Services, Urbana
- Orthodontist, Urbana - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Urbana
- Other Lodging, Urbana
- Outdoor & Lawn & Garden Equipment Repair & Service, Urbana
- Overhead Door, Urbana
- Oxygen & Respiratory Equipment & Supplies, Urbana - Oxygen Concentrator, Tank, Machine, etc
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