- Obstetricians & Gynecologists, Des Plaines - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Des Plaines
- Occupational Therapy, Des Plaines - Occupational Health Specialists
- Office Buildings & Parks, Des Plaines
- Office Equipment & Supplies Manufacturers, Des Plaines
- Office Supplies, Equipment & Office Furniture Stores, Des Plaines
- Oil & Petroleum Products, Des Plaines - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Des Plaines - Auto Oil & Quick Lube
- Ophthalmic Goods, Des Plaines
- Ophthalmologists, Des Plaines - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Des Plaines
- Opticians, Des Plaines
- Optometrists, Des Plaines - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Des Plaines - Eye Clinics
- Oral Surgeon, Des Plaines - Dentists - Oral & Maxillofacial Surgeons
- Oriental Goods & Products Stores, Des Plaines
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- Ornamental Nursery, Des Plaines
- Ornamental Nursery Products, Des Plaines
- Ornamental Nursery Services, Des Plaines
- Orthodontist, Des Plaines - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Des Plaines
- Orthopedists, Des Plaines - Orthopedic Surgery Doctors, Physicians & Surgeons
- Osteoporosis Doctors, Des Plaines - Physicians & Surgeons
- Other Attorneys & Lawyers, Des Plaines
- Other Attorneys & Lawyers, Des Plaines
- Other Building Materials & Supplies, Des Plaines
- Other Electrical Products, Des Plaines
- Other Lawyers & Attorneys, Des Plaines
- Other Lodging, Des Plaines
- Other Office Supply Stores, Des Plaines
- Outdoor Furniture & Patio Furniture, Des Plaines - Garden Furniture Stores
- Ownership Organizations, Des Plaines
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