- Obstetricians & Gynecologists, Zionsville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Zionsville
- Oil Change & Lubrication, Zionsville - Auto Oil & Quick Lube
- Ophthalmologists, Zionsville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Zionsville - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Zionsville
- Opticians, Zionsville
- Optometrists, Zionsville - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Zionsville - Eye Clinics
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- Ornamental Nursery, Zionsville
- Ornamental Nursery Services, Zionsville
- Orthodontist, Zionsville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Zionsville - Orthopedic Shoes
- Osteoporosis Doctors, Zionsville - Physicians & Surgeons
- Other Building Materials & Supplies, Zionsville
- Outdoor & Lawn & Garden Equipment Repair & Service, Zionsville
- Outdoor Equipment & Accessories, Zionsville
- Outpatient Clinics, Zionsville - Care & Treatment Centers
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