- Oil & Gas Companies, Rock Falls
- Oil & Petroleum Products, Rock Falls - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Rock Falls - Auto Oil & Quick Lube
- Old Age Homes Service, Rock Falls
- Open Bible Church, Rock Falls
- Ophthalmic Goods, Rock Falls
- Ophthalmologists, Rock Falls - Eye Doctors, Physicians & Surgeons (Ophthalmology)
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- Optometrists, Rock Falls - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Rock Falls
- Ornamental Nursery Services, Rock Falls
- Other Building Materials & Supplies, Rock Falls
- Outdoor & Lawn & Garden Equipment Repair & Service, Rock Falls
- Outdoor Equipment & Accessories, Rock Falls
- Oxygen & Respiratory Equipment & Supplies, Rock Falls - Oxygen Concentrator, Tank, Machine, etc
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