- Obstetricians & Gynecologists, Adel - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Adel
- Oil & Petroleum Retail, Adel
- Oil Industry & Oil Field Equipment & Services, Adel - Oil Companies
- Oil Petroleum Wholesale, Adel
- Optometrists, Adel - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Adel
- Ornamental Nursery Products, Adel
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