- Obstetricians & Gynecologists, Lake Zurich - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Lake Zurich
- Occupational Therapy, Lake Zurich - Occupational Health Specialists
- Office Buildings & Parks, Lake Zurich
- Office Partitions & Dividers, Lake Zurich
- Office Supplies, Equipment & Office Furniture Stores, Lake Zurich
- Oil Change & Lubrication, Lake Zurich - Auto Oil & Quick Lube
- Ophthalmologists, Lake Zurich - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lake Zurich
- Opticians, Lake Zurich
- Optometrists, Lake Zurich - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Lake Zurich - Eye Clinics
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- Oral Surgeon, Lake Zurich - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Lake Zurich
- Ornamental Nursery, Lake Zurich
- Ornamental Nursery Services, Lake Zurich
- Orthodontist, Lake Zurich - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Lake Zurich - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Lake Zurich
- Outdoor & Lawn & Garden Equipment Repair & Service, Lake Zurich
- Outdoor Centers, Lake Zurich
- Outdoor Equipment & Accessories, Lake Zurich
- Outdoor Power Equipment, Lake Zurich
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