- Obstetricians & Gynecologists, Normal - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Normal
- Occupational Health Care Physicians & Surgeons, Normal - Occupational Medicine
- Occupational Health Care Professionals, Normal
- Off Track Betting, Normal
- Office Supplies, Equipment & Office Furniture Stores, Normal
- Oil Change & Lubrication, Normal - Auto Oil & Quick Lube
- Oncologists, Normal - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Normal - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Normal
- Opticians, Normal
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- Optometrists, Normal - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchestras, Symphonies & Bands, Normal
- Ornamental Nursery, Normal
- Ornamental Nursery Products, Normal
- Orthodontist, Normal - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Normal - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Normal
- Other Building Materials & Supplies, Normal
- Outdoor & Lawn & Garden Equipment Repair & Service, Normal
- Outdoor Equipment & Accessories, Normal
- Outpatient Services, Normal - Outpatient Care
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