- Occupational Health & Safety, Franklin Park
- Occupational Health Care Professionals, Franklin Park
- Office Buildings & Parks, Franklin Park
- Office Supplies, Equipment & Office Furniture Stores, Franklin Park
- Oil Change & Lubrication, Franklin Park - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Franklin Park - Oil Companies
- Oils Industrial, Franklin Park
- Ophthalmic Goods, Franklin Park
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Franklin Park
- Opticians, Franklin Park
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- Optometrists, Franklin Park - Eye Doctors, Physicians & Surgeons (Optometry)
- Organizing Services & Products – Household & Business, Franklin Park
- Oriental Goods & Products Stores, Franklin Park
- Oriental Restaurants, Franklin Park
- Ornamental Iron - Residential, Franklin Park - Wrought Iron Work Supplies, Parts, Gates, Railings, Stairs, Spirals, Fence, etc
- Ornamental Metal Work, Franklin Park - Steel, Iron, Bronze, etc
- Ornamental Nursery, Franklin Park
- Ornamental Nursery Services, Franklin Park
- Orthodontist, Franklin Park - Teeth Straightening, Invisalign & Dental Braces
- Other Building Materials & Supplies, Franklin Park
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