- Office Buildings & Parks, Chicago Ridge
- Office Supplies, Equipment & Office Furniture Stores, Chicago Ridge
- Oil & Petroleum Products, Chicago Ridge - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Chicago Ridge - Auto Oil & Quick Lube
- Ophthalmologists, Chicago Ridge - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Chicago Ridge
- Opticians, Chicago Ridge
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- Optometrists, Chicago Ridge - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Chicago Ridge
- Ornamental Nursery, Chicago Ridge
- Ornamental Nursery Services, Chicago Ridge
- Other Building Materials & Supplies, Chicago Ridge
- Outerwear Stores, Chicago Ridge - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Ownership Organizations, Chicago Ridge
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