- Obstetricians & Gynecologists, Waupun - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Waupun
- Oil Field Services Mud Disposal & Jacking, Waupun
- Oil Industry & Oil Field Equipment & Services, Waupun - Oil Companies
- Oil Refinery, Waupun
- Ophthalmologists, Waupun - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Opticians, Waupun
- Optometrists, Waupun - Eye Doctors, Physicians & Surgeons (Optometry)
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