- Obstetricians & Gynecologists, Painesville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Painesville
- Occupational Health Care Physicians & Surgeons, Painesville - Occupational Medicine
- Occupational Health Care Professionals, Painesville
- Occupational Medicine Doctors, Painesville - Physicians & Surgeons
- Office Buildings & Parks, Painesville
- Office Supplies, Equipment & Office Furniture Stores, Painesville
- Oil And Petroleum Products, Painesville
- Oil Change & Lubrication, Painesville - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Painesville - Oil Companies
- Oil Petroleum Wholesale, Painesville
- Ophthalmologists, Painesville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Painesville
- Optometrists, Painesville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Greenhouses, Painesville
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- Ornamental Nursery, Painesville
- Ornamental Nursery Services, Painesville
- Orthopedic & Prosthetic Appliances & Shoes, Painesville - Orthopedic Shoes
- Orthopedists, Painesville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Painesville
- Other Attorneys & Lawyers, Painesville
- Other Building Materials & Supplies, Painesville
- Other Lawyers & Attorneys, Painesville
- Outboard Motors Parts & Repair, Painesville
- Outdoor & Lawn & Garden Equipment Repair & Service, Painesville
- Outdoor Equipment & Accessories, Painesville
- Outpatient Services, Painesville - Outpatient Care
- Overhead Door, Painesville
- Oxygen & Respiratory Equipment & Supplies, Painesville - Oxygen Concentrator, Tank, Machine, etc
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