- Occupational Health Care Professionals, Springfield
- Occupational Therapy, Springfield - Occupational Health Specialists
- Off Road Vehicles, Springfield
- Off Road Vehicles Parts & Accessories, Springfield
- Office Supplies, Equipment & Office Furniture Stores, Springfield
- Oil Change & Lubrication, Springfield - Auto Oil & Quick Lube
- Open Bible Church, Springfield
- Ophthalmic Goods, Springfield
- Ophthalmologists, Springfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Springfield - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Springfield
- Opticians, Springfield
- Optometrists, Springfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, Springfield - Eye Clinics
- Oral Surgeon, Springfield - Dentists - Oral & Maxillofacial Surgeons
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- Oriental Goods & Products Stores, Springfield
- Oriental Rugs, Springfield
- Ornamental Nursery, Springfield
- Ornamental Nursery Services, Springfield
- Orthodontist, Springfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedists, Springfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Other Building Materials & Supplies, Springfield
- Other Electrical Products, Springfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Springfield
- Outdoor Equipment & Accessories, Springfield
- Outdoor Furniture & Patio Furniture, Springfield - Garden Furniture Stores
- Outerwear Stores, Springfield - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Ownership Organizations, Springfield
- Oxygen & Respiratory Equipment & Supplies, Springfield - Oxygen Concentrator, Tank, Machine, etc
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