- Obstetricians & Gynecologists, Oak Lawn - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Oak Lawn
- Oil & Gas Additives & Supplies, Oak Lawn
- Oil Change & Lubrication, Oak Lawn - Auto Oil & Quick Lube
- Oncologists, Oak Lawn - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Oak Lawn - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Oak Lawn
- Opticians, Oak Lawn
- Optometrists, Oak Lawn - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Oak Lawn
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- Ornamental Nursery Services, Oak Lawn
- Orthodontist, Oak Lawn - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Oak Lawn - Orthopedic Shoes
- Orthopedists, Oak Lawn - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Oak Lawn
- Other Lodging, Oak Lawn
- Outdoor Equipment & Accessories, Oak Lawn
- Outdoor Furniture & Patio Furniture, Oak Lawn - Garden Furniture Stores
- Outpatient Services, Oak Lawn - Outpatient Care
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