- Obstetricians & Gynecologists, Springfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health & Safety, Springfield
- Occupational Health Care Professionals, Springfield
- Occupational Therapy, Springfield - Occupational Health Specialists
- Off Road Vehicles, Springfield
- Off Road Vehicles Parts & Accessories, Springfield
- Office Buildings & Parks, Springfield
- Office Planning & Design, Springfield
- Office Supplies, Equipment & Office Furniture Stores, Springfield
- Oil & Gas Companies, Springfield
- Oil & Petroleum Products, Springfield - Merchant, Wholesalers, etc
- Oil Burners Services, Springfield
- Oil Change & Lubrication, Springfield - Auto Oil & Quick Lube
- Oil Industry & Oil Field Equipment & Services, Springfield - Oil Companies
- Oil Petroleum Wholesale, Springfield
- Oils & Greases, Springfield
- Oncologists, Springfield - Cancer Doctors, Physicians & Surgeons (Oncology)
- Ophthalmologists, Springfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Springfield
- Opticians, Springfield
- Optometrists, Springfield - Eye Doctors, Physicians & Surgeons (Optometry)
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- Optometry Clinics, Springfield - Eye Clinics
- Oral Surgeon, Springfield - Dentists - Oral & Maxillofacial Surgeons
- Ores, Springfield
- Organs Tuning & Repair, Springfield
- Oriental Goods & Products Stores, Springfield
- Ornamental Nursery, Springfield
- Ornamental Nursery Services, Springfield
- Orthodontist, Springfield - Teeth Straightening, Invisalign & Dental Braces
- Orthodox Churches, Springfield
- Orthopedic & Prosthetic Appliances & Shoes, Springfield - Orthopedic Shoes
- Orthopedic Shoes, Springfield
- Orthopedists, Springfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Springfield
- Other Building Materials & Supplies, 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
- Outpatient Clinics, Springfield - Care & Treatment Centers
- Outpatient Services, Springfield - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, Springfield - Oxygen Concentrator, Tank, Machine, etc
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