- Off Road Vehicles, Charles City
- Off Road Vehicles Parts & Accessories, Charles City
- Office Supplies, Equipment & Office Furniture Stores, Charles City
- Oil & Gas Companies, Charles City
- Oil Change & Lubrication, Charles City - Auto Oil & Quick Lube
- Ophthalmologists, Charles City - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optometrists, Charles City - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Charles City
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- Ornamental Nursery, Charles City
- Ornamental Nursery Services, Charles City
- Orthodontist, Charles City - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Charles City - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Charles City
- Other Lodging, Charles City
- Outdoor & Lawn & Garden Equipment Repair & Service, Charles City
- Outdoor Furniture & Patio Furniture, Charles City - Garden Furniture Stores
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