- Obstetricians & Gynecologists, Vernon Hills - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Vernon Hills
- Occupational Therapy, Vernon Hills - Occupational Health Specialists
- Office Buildings & Parks, Vernon Hills
- Office Supplies, Equipment & Office Furniture Stores, Vernon Hills
- Oil & Gas Producers, Vernon Hills - Companies
- Oil Change & Lubrication, Vernon Hills - Auto Oil & Quick Lube
- Oil Field Contractors, Vernon Hills
- Oil Industry & Oil Field Equipment & Services, Vernon Hills - Oil Companies
- Old Age Homes Service, Vernon Hills
- Ophthalmologists, Vernon Hills - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Vernon Hills
- Opticians, Vernon Hills
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- Optometrists, Vernon Hills - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Vernon Hills
- Ornamental Nursery Services, Vernon Hills
- Orthodontist, Vernon Hills - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Vernon Hills - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Vernon Hills - Physicians & Surgeons
- Other Building Materials & Supplies, Vernon Hills
- Other Electrical Products, Vernon Hills
- Other Lodging, Vernon Hills
- Other Specialties, Vernon Hills - Doctors, Physicians & Surgeons
- Outerwear Stores, Vernon Hills - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Vernon Hills - Outpatient Care
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