- Obstetricians & Gynecologists, Sycamore - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Sycamore
- Off Road Vehicles Parts & Accessories, Sycamore
- Office Buildings & Parks, Sycamore
- Oil Change & Lubrication, Sycamore - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Sycamore - Oil Companies
- Oils Industrial, Sycamore
- Ophthalmic Goods, Sycamore
- Ophthalmic Instruments & Machinery, Sycamore
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Sycamore
- Opticians, Sycamore
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- Optometrists, Sycamore - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Sycamore - Dentists - Oral & Maxillofacial Surgeons
- Orchard Service, Sycamore
- Ornamental Nursery, Sycamore
- Ornamental Nursery Services, Sycamore
- Orthodontist, Sycamore - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Sycamore - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Sycamore
- Other Lodging, Sycamore
- Outdoor & Lawn & Garden Equipment Repair & Service, Sycamore
- Outdoor Equipment & Accessories, Sycamore
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