- Obstetricians & Gynecologists, Springfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Off Road Vehicles, Springfield
- Off Road Vehicles Parts & Accessories, Springfield
- Office Space on Rent, Springfield - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Springfield
- Oil Burners Services, Springfield
- Oil Change & Lubrication, Springfield - Auto Oil & Quick Lube
- Old Age Homes Service, Springfield
- Oncologists, Springfield - Cancer Doctors, Physicians & Surgeons (Oncology)
- Open Bible Church, Springfield
- Ophthalmologists, Springfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Manufacturers, Springfield
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Springfield
- Opticians, Springfield
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- Optometrists, Springfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Ornamental Nursery, Springfield
- Ornamental Nursery Services, Springfield
- Orthodox Churches, Springfield
- Orthopedic & Prosthetic Appliances & Shoes, Springfield - Orthopedic Shoes
- Orthopedists, Springfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Springfield
- Other Lodging, Springfield
- Outboard Motors Parts & Repair, Springfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Springfield
- Outdoor Drama Theaters, Springfield
- Outdoor Equipment & Accessories, Springfield
- Outpatient Services, Springfield - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Springfield - Oxygen Concentrator, Tank, Machine, etc
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