- Office Buildings & Parks, Springfield
- Office Supplies, Equipment & Office Furniture Stores, Springfield
- Oil & Gas Companies, Springfield
- Oil Change & Lubrication, Springfield - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Springfield - Oil Companies
- Oil Petroleum Wholesale, Springfield
- Oncologists, Springfield - Cancer Doctors, Physicians & Surgeons (Oncology)
- Optical Goods Repair & Service, Springfield - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Springfield
- Opticians, Springfield
- Optometrists, Springfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Springfield - Dentists - Oral & Maxillofacial Surgeons
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- Ornamental Greenhouses, Springfield
- Ornamental Nursery, Springfield
- Ornamental Nursery Products, Springfield
- Ornamental Nursery Services, Springfield
- Orthodontist, Springfield - Teeth Straightening, Invisalign & Dental Braces
- Other Attorneys & Lawyers, Springfield
- Other Attorneys & Lawyers, Springfield
- Other Building Materials & Supplies, Springfield
- Other Lawyers & Attorneys, Springfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Springfield
- Outdoor Equipment & Accessories, Springfield
- Outpatient Services, Springfield - Outpatient Care
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