- Obstetricians & Gynecologists, Yorkville - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Professionals, Yorkville
- Occupational Therapy, Yorkville - Occupational Health Specialists
- Office Buildings & Parks, Yorkville
- Office Supplies, Equipment & Office Furniture Stores, Yorkville
- Oil Change & Lubrication, Yorkville - Auto Oil & Quick Lube
- Oncologists, Yorkville - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Yorkville - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Yorkville
- Optometrists, Yorkville - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Yorkville
- Ornamental Nursery Products, Yorkville
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- Ornamental Nursery Services, Yorkville
- Orthodontist, Yorkville - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Yorkville - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Attorneys & Lawyers, Yorkville
- Other Attorneys & Lawyers, Yorkville
- Other Building Materials & Supplies, Yorkville
- Other Lawyers & Attorneys, Yorkville
- Outdoor & Lawn & Garden Equipment Repair & Service, Yorkville
- Outdoor Equipment & Accessories, Yorkville
- Overhead Door, Yorkville
- Ownership Organizations, Yorkville
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