- Obstetricians & Gynecologists, Springfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Supplies, Equipment & Office Furniture Stores, Springfield
- Oil & Petroleum Products, Springfield - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Springfield - Auto Oil & Quick Lube
- Ophthalmologists, Springfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Springfield - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Springfield
- Opticians, Springfield
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- Optometrists, Springfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Orthodontist, Springfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Springfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Springfield
- Osteoporosis Doctors, Springfield - Physicians & Surgeons
- Other Building Materials & Supplies, Springfield
- Outdoor Equipment & Accessories, Springfield
- Outerwear Stores, Springfield - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
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