- Obstetricians & Gynecologists, Sheffield Village - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Sheffield Village
- Occupational Health Care Physicians & Surgeons, Sheffield Village - Occupational Medicine
- Occupational Health Care Professionals, Sheffield Village
- Occupational Medicine Doctors, Sheffield Village - Physicians & Surgeons
- Office Supplies, Equipment & Office Furniture Stores, Sheffield Village
- Oil Change & Lubrication, Sheffield Village - Auto Oil & Quick Lube
- Ophthalmologists, Sheffield Village - Eye Doctors, Physicians & Surgeons (Ophthalmology)
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- Optical Stores - Eyeglasses, Lenses & Sunglasses, Sheffield Village
- Optometrists, Sheffield Village - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Sheffield Village
- Orthodox Churches, Sheffield Village
- Orthopedists, Sheffield Village - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Sheffield Village
- Outdoor & Lawn & Garden Equipment Repair & Service, Sheffield Village
- Outdoor Equipment & Accessories, Sheffield Village
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