- Office Buildings & Parks, Rock Island
- Office Supplies, Equipment & Office Furniture Stores, Rock Island
- Oil Change & Lubrication, Rock Island - Auto Oil & Quick Lube
- Oil Field Services Mud Disposal & Jacking, Rock Island
- Oil Industry & Oil Field Equipment & Services, Rock Island - Oil Companies
- Old Age Homes Service, Rock Island
- Ophthalmic Goods, Rock Island
- Ophthalmologists, Rock Island - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Rock Island
- Opticians, Rock Island
- Optometrists, Rock Island - Eye Doctors, Physicians & Surgeons (Optometry)
- Oriental Goods & Products Stores, Rock Island
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- Oriental Restaurants, Rock Island
- Ornamental Nursery, Rock Island
- Ornamental Nursery Services, Rock Island
- Orthodontist, Rock Island - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Rock Island - Orthopedic Shoes
- Other Building Materials & Supplies, Rock Island
- Outboard Motors, Rock Island
- Outdoor & Lawn & Garden Equipment Repair & Service, Rock Island
- Outdoor Equipment & Accessories, Rock Island
- Outdoor Furniture & Patio Furniture, Rock Island - Garden Furniture Stores
- Outpatient Services, Rock Island - Outpatient Care
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