- Office Supplies, Equipment & Office Furniture Stores, Morton
- Oil Change & Lubrication, Morton - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Morton
- Opticians, Morton
- Optometrists, Morton - Eye Doctors, Physicians & Surgeons (Optometry)
- Orchard Service, Morton
- Organizing Services & Products – Household & Business, Morton
- Ornamental Greenhouses, Morton
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