- Obstetricians & Gynecologists, Owosso - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Owosso
- Off Road Vehicles Parts & Accessories, Owosso
- Office Supplies, Equipment & Office Furniture Stores, Owosso
- Oil & Gas Companies, Owosso
- Oil & Petroleum Products, Owosso - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Owosso - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Owosso - Oil Companies
- Oil Petroleum Wholesale, Owosso
- Ophthalmologists, Owosso - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Owosso
- Opticians, Owosso
- Optometrists, Owosso - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Owosso - Eye Clinics
- Oral Surgeon, Owosso - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Greenhouses, Owosso
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- Ornamental Nursery, Owosso
- Ornamental Nursery Services, Owosso
- Orthodontist, Owosso - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Owosso - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Owosso
- Other Attorneys & Lawyers, Owosso
- Other Attorneys & Lawyers, Owosso
- Other Building Materials & Supplies, Owosso
- Other Lawyers & Attorneys, Owosso
- Other Lodging, Owosso
- Otolaryngologists, Owosso - Ear, Nose, Throat - ENT Doctors, Physicians & Surgeons (Otolaryngology)
- Outdoor & Lawn & Garden Equipment Repair & Service, Owosso
- Outdoor Advertising & Billboard, Owosso
- Outdoor Equipment & Accessories, Owosso
- Outpatient Services, Owosso - Outpatient Care
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