- Obstetricians & Gynecologists, Hoffman Estates - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Hoffman Estates
- Occupational Therapy, Hoffman Estates - Occupational Health Specialists
- Office Buildings & Parks, Hoffman Estates
- Office Space on Rent, Hoffman Estates - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Hoffman Estates
- Oil Change & Lubrication, Hoffman Estates - Auto Oil & Quick Lube
- Old Age Homes Service, Hoffman Estates
- Oncologists, Hoffman Estates - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Hoffman Estates - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Hoffman Estates
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- Opticians, Hoffman Estates
- Optometrists, Hoffman Estates - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Hoffman Estates - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Metal Work, Hoffman Estates - Steel, Iron, Bronze, etc
- Orthodontist, Hoffman Estates - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Hoffman Estates - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Hoffman Estates - Physicians & Surgeons
- Other Building Materials & Supplies, Hoffman Estates
- Outpatient Services, Hoffman Estates - Outpatient Care
- Overhead Door, Hoffman Estates
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