- Obstetricians & Gynecologists, Chillicothe - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Chillicothe - Occupational Medicine
- Occupational Health Care Professionals, Chillicothe
- Office & Meeting Equipment & Supplies Rental, Chillicothe
- Office Supplies, Equipment & Office Furniture Stores, Chillicothe
- Oil & Gas Companies, Chillicothe
- Oil Change & Lubrication, Chillicothe - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Chillicothe - Oil Companies
- Oil Petroleum Wholesale, Chillicothe
- Oncologists, Chillicothe - Cancer Doctors, Physicians & Surgeons (Oncology)
- Open Door Church, Chillicothe
- Ophthalmologists, Chillicothe - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Chillicothe
- Opticians, Chillicothe
- Optometrists, Chillicothe - Eye Doctors, Physicians & Surgeons (Optometry)
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- Oral Surgeon, Chillicothe - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Chillicothe
- Organs Tuning & Repair, Chillicothe
- Ornamental Nursery, Chillicothe
- Ornamental Nursery Services, Chillicothe
- Orthodontist, Chillicothe - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Chillicothe - Orthopedic Shoes
- Orthopedic Shoes, Chillicothe
- Orthopedists, Chillicothe - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Chillicothe
- Other Industrial Contractors, Chillicothe
- Outdoor Equipment & Accessories, Chillicothe
- Outdoor Furniture & Patio Furniture, Chillicothe - Garden Furniture Stores
- Overhead Door, Chillicothe
- Oxygen & Respiratory Equipment & Supplies, Chillicothe - Oxygen Concentrator, Tank, Machine, etc
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