- Obstetricians & Gynecologists, Herrin - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Herrin
- Occupational Health Care Physicians & Surgeons, Herrin - Occupational Medicine
- Occupational Health Care Professionals, Herrin
- Occupational Medicine Doctors, Herrin - Physicians & Surgeons
- Office Supplies, Equipment & Office Furniture Stores, Herrin
- Oil Change & Lubrication, Herrin - Auto Oil & Quick Lube
- Ophthalmologists, Herrin - Eye Doctors, Physicians & Surgeons (Ophthalmology)
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- Optometrists, Herrin - Eye Doctors, Physicians & Surgeons (Optometry)
- Orthodontist, Herrin - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Herrin - Orthopedic Shoes
- Orthotics and Prosthetics, Herrin
- Other Building Materials & Supplies, Herrin
- Outdoor & Lawn & Garden Equipment Repair & Service, Herrin
- Outpatient Services, Herrin - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Herrin - Oxygen Concentrator, Tank, Machine, etc
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