- Office Supplies, Equipment & Office Furniture Stores, Rockford
- Oil & Gas Exploration & Development, Rockford - Oil Field Exploration, Monitoring & Remediation
- Oil Change & Lubrication, Rockford - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Rockford - Oil Companies
- Ophthalmologists, Rockford - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Rockford
- Opticians, Rockford
- Optometrists, Rockford - Eye Doctors, Physicians & Surgeons (Optometry)
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- Ornamental Nursery, Rockford
- Ornamental Nursery Services, Rockford
- Orthodontist, Rockford - Teeth Straightening, Invisalign & Dental Braces
- Other Electrical Products, Rockford
- Outboard Motors Parts & Repair, Rockford
- Outdoor & Lawn & Garden Equipment Repair & Service, Rockford
- Outdoor Equipment & Accessories, Rockford
- Oxygen & Respiratory Equipment & Supplies, Rockford - Oxygen Concentrator, Tank, Machine, etc
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