- Obstetricians & Gynecologists, Batavia - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Batavia
- Oil Industry & Oil Field Equipment & Services, Batavia - Oil Companies
- Oil Petroleum Wholesale, Batavia
- Ophthalmologists, Batavia - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opticians, Batavia
- Optometrists, Batavia - Eye Doctors, Physicians & Surgeons (Optometry)
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