- Obstetricians & Gynecologists, Tiffin - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Tiffin
- Occupational Health Care Professionals, Tiffin
- Occupational Therapy, Tiffin - Occupational Health Specialists
- Off Road Vehicles, Tiffin
- Off Road Vehicles Parts & Accessories, Tiffin
- Office Supplies, Equipment & Office Furniture Stores, Tiffin
- Oil Change & Lubrication, Tiffin - Auto Oil & Quick Lube
- Oncologists, Tiffin - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Tiffin - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Tiffin
- Optometrists, Tiffin - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Tiffin - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Greenhouses, Tiffin
- Ornamental Nursery, Tiffin
- Ornamental Nursery Products, Tiffin
- Ornamental Nursery Services, Tiffin
- Orthopedic Shoes, Tiffin
- Orthopedists, Tiffin - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Tiffin
- Other Attorneys & Lawyers, Tiffin
- Other Building Materials & Supplies, Tiffin
- Other Lawyers & Attorneys, Tiffin
- Outdoor & Lawn & Garden Equipment Repair & Service, Tiffin
- Outdoor Equipment & Accessories, Tiffin
- Oxygen & Respiratory Equipment & Supplies, Tiffin - Oxygen Concentrator, Tank, Machine, etc
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