- Obstetricians & Gynecologists, Springfield - Ob-Gyn Doctors, Physicians & Surgeons (Obstetrics & Gynecology)
- Occupational Health Care Physicians & Surgeons, Springfield - Occupational Medicine
- Occupational Health Care Professionals, Springfield
- Occupational Therapy, Springfield - Occupational Health Specialists
- Office Buildings & Parks, Springfield
- Office Equipment & Supplies Manufacturers, Springfield
- Office Furniture & Equipment Repair & Refinish, Springfield
- Office Partitions & Dividers, Springfield
- Office Space on Rent, Springfield - Executive Suites, Meeting Rooms, Conference Rooms, Virtual Offices, etc
- Office Supplies, Equipment & Office Furniture Stores, Springfield
- Oil & Gas Companies, Springfield
- Oil & Gas Producers, Springfield - Companies
- Oil & Petroleum Products, Springfield - Merchant, Wholesalers, etc
- Oil Change & Lubrication, Springfield - Auto Oil & Quick Lube
- Oil Field Contractors, Springfield
- Oil Field Services Mud Disposal & Jacking, Springfield
- Oil Handling Equipment & Supplies, Springfield
- Oil Industry & Oil Field Equipment & Services, Springfield - Oil Companies
- Oil Well Equipment & Supplies, Springfield
- Oils Industrial, Springfield
- Old Age Homes Service, Springfield
- Oncologists, Springfield - Cancer Doctors, Physicians & Surgeons (Oncology)
- Online Advertising, Springfield - Internet Advertising
- Ophthalmologists, Springfield - Eye Doctors, Physicians & Surgeons (Ophthalmology)
- Optical Goods Repair & Service, Springfield - Camera Repair
- Optical Stores - Eyeglasses, Lenses & Sunglasses, Springfield
- Opticians, Springfield
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- Optometrists, Springfield - Eye Doctors, Physicians & Surgeons (Optometry)
- Oral Surgeon, Springfield - Dentists - Oral & Maxillofacial Surgeons
- Orchestras, Symphonies & Bands, Springfield
- Organizing Services & Products – Household & Business, Springfield
- Ornamental Nursery, Springfield
- Ornamental Nursery Services, Springfield
- Orthodontist, Springfield - Teeth Straightening, Invisalign & Dental Braces
- Orthopedic & Prosthetic Appliances & Shoes, Springfield - Orthopedic Shoes
- Orthopedists, Springfield - Orthopedic Surgery Doctors, Physicians & Surgeons
- Orthotics and Prosthetics, Springfield
- Osteoporosis Doctors, Springfield - Physicians & Surgeons
- Other Attorneys & Lawyers, Springfield
- Other Attorneys & Lawyers, Springfield
- Other Building Materials & Supplies, Springfield
- Other Lawyers & Attorneys, Springfield
- Other Lodging, Springfield
- Other Office Supply Stores, Springfield
- Outdoor & Lawn & Garden Equipment Repair & Service, Springfield
- Outdoor Advertising & Billboard, Springfield
- Outdoor Equipment & Accessories, Springfield
- Outdoor Furniture, Springfield
- Outdoor Furniture & Patio Furniture, Springfield - Garden Furniture Stores
- Outerwear Stores, Springfield - Jackets, Sunglasses, Hats, Caps, Coats, Gloves & More
- Outpatient Services, Springfield - Outpatient Care
- Ownership Organizations, Springfield
- Oxygen & Respiratory Equipment & Supplies, Springfield - Oxygen Concentrator, Tank, Machine, etc
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