- Office Buildings & Parks, Mundelein
- Office Supplies, Equipment & Office Furniture Stores, Mundelein
- Oil & Gas Companies, Mundelein
- Oil & Petroleum Products, Mundelein - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Mundelein - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Mundelein - Oil Companies
- Oil Petroleum Wholesale, Mundelein
- Ophthalmologists, Mundelein - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Mundelein
- Opticians, Mundelein
- Optometrists, Mundelein - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Greenhouses, Mundelein
- Ornamental Metal Work, Mundelein - Steel, Iron, Bronze, etc
- Ornamental Nursery, Mundelein
- Ornamental Nursery Services, Mundelein
- Other Building Materials & Supplies, Mundelein
- Other Lodging, Mundelein
- Outdoor & Lawn & Garden Equipment Repair & Service, Mundelein
- Outdoor Equipment & Accessories, Mundelein
- Outpatient Services, Mundelein - Outpatient Care
- Ownership Organizations, Mundelein
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