- Occupational Health Care Professionals, Lombard
- Occupational Therapy, Lombard - Occupational Health Specialists
- Oceanographic Services, Lombard
- Office Buildings & Parks, Lombard
- Office Supplies, Equipment & Office Furniture Stores, Lombard
- Offset Printing, Lombard
- Oil Change & Lubrication, Lombard - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Lombard - Oil Companies
- Oil Refinery, Lombard
- Oncologists, Lombard - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Lombard - Internet Advertising
- Ophthalmologists, Lombard - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Lombard
- Opticians, Lombard
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- Optometrists, Lombard - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Lombard - Dentists - Oral & Maxillofacial Surgeons
- Ornamental Nursery, Lombard
- Ornamental Nursery Services, Lombard
- Orthodontist, Lombard - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Lombard - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Lombard
- Other Electrical Products, Lombard
- Other Lodging, Lombard
- Outdoor & Lawn & Garden Equipment Repair & Service, Lombard
- Outdoor Equipment & Accessories, Lombard
- Outerwear Stores, Lombard - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Overhead Door, Lombard
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