- Obstetricians & Gynecologists, Avon - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Avon
- Oil Change & Lubrication, Avon - Auto Oil & Quick Lube
- Ophthalmologists, Avon - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Avon
- Opticians, Avon
- Optometrists, Avon - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Avon
- Ornamental Nursery, Avon
- Ornamental Nursery Products, Avon
- Ornamental Nursery Services, Avon
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- Orthodontist, Avon - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Avon
- Orthopedic & Prosthetic Appliances & Shoes, Avon - Orthopedic Shoes
- Orthopedists, Avon - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Avon
- Other Electrical Products, Avon
- Other Lodging, Avon
- Outdoor & Lawn & Garden Equipment Repair & Service, Avon
- Outdoor Equipment & Accessories, Avon
- Outdoor Furniture, Avon
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