- Occupational Health & Safety, Waukegan
- Occupational Health Care Professionals, Waukegan
- Office Buildings & Parks, Waukegan
- Office Supplies, Equipment & Office Furniture Stores, Waukegan
- Oil Change & Lubrication, Waukegan - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Waukegan
- Opticians, Waukegan
- Optometrists, Waukegan - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Waukegan
- Ornamental Nursery Services, Waukegan
- Orthodontist, Waukegan - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Waukegan - Orthopedic Surgery Doctors, Physicians & Surgeons
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- Other Attorneys & Lawyers, Waukegan
- Other Attorneys & Lawyers, Waukegan
- Other Building Materials & Supplies, Waukegan
- Other Electrical Products, Waukegan
- Other Industrial Goods, Waukegan
- Other Lawyers & Attorneys, Waukegan
- Other Lodging, Waukegan
- Outdoor Equipment & Accessories, Waukegan
- Outpatient Clinics, Waukegan - Care & Treatment Centers
- Outpatient Services, Waukegan - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Waukegan - Oxygen Concentrator, Tank, Machine, etc
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