- Obstetricians & Gynecologists, Jerseyville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Jerseyville
- Oil Change & Lubrication, Jerseyville - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Jerseyville
- Opticians, Jerseyville
- Optometrists, Jerseyville - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Jerseyville
- Ornamental Greenhouses, Jerseyville
- Ornamental Nursery, Jerseyville
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- Ornamental Nursery Products, Jerseyville
- Ornamental Nursery Services, Jerseyville
- Orthodontist, Jerseyville - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Jerseyville
- Outdoor & Lawn & Garden Equipment Repair & Service, Jerseyville
- Outdoor Equipment & Accessories, Jerseyville
- Outpatient Services, Jerseyville - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Jerseyville - Oxygen Concentrator, Tank, Machine, etc
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