- Obstetricians & Gynecologists, West Springfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Office Partitions & Dividers, West Springfield
- Office Supplies, Equipment & Office Furniture Stores, West Springfield
- Oil & Gas Companies, West Springfield
- Oil Burners Services, West Springfield
- Oil Change & Lubrication, West Springfield - Auto Oil & Quick Lube
- Optical Stores - Eyeglasses, Lenses & Sunglasses, West Springfield
- Opticians, West Springfield
- Optometrists, West Springfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Optometry Clinics, West Springfield - Eye Clinics
- Oral Surgeon, West Springfield - Dentists - Oral & Maxillofacial Surgeons
- Orthodontist, West Springfield - Teeth Straightening, Invisalign & Dental Braces
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- Orthopedic & Prosthetic Appliances & Shoes, West Springfield - Orthopedic Shoes
- Orthopedic Shoes, West Springfield
- Orthotics and Prosthetics, West Springfield
- Other Attorneys & Lawyers, West Springfield
- Other Attorneys & Lawyers, West Springfield
- Other Building Materials & Supplies, West Springfield
- Other Lawyers & Attorneys, West Springfield
- Outdoor Advertising & Billboard, West Springfield
- Outdoor Equipment & Accessories, West Springfield
- Outpatient Services, West Springfield - Outpatient Care
- Oxygen & Respiratory Equipment & Supplies, West Springfield - Oxygen Concentrator, Tank, Machine, etc
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