- Obstetricians & Gynecologists, Dexter - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Dexter
- Off Road Vehicles Parts & Accessories, Dexter
- Oil & Petroleum Products, Dexter - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Dexter - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Dexter - Oil Companies
- Ophthalmologists, Dexter - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Dexter
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- Optometrists, Dexter - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Dexter - Eye Clinics
- Other Lodging, Dexter
- Outdoor & Lawn & Garden Equipment Repair & Service, Dexter
- Outdoor Equipment & Accessories, Dexter
- Outerwear Stores, Dexter - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Dexter - Outpatient Care
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