- Ice Cream & Frozen Yogurt, Springfield
- Ice Sports Clubs & Instruction, Springfield
- Independent Church, Springfield
- Industrial & Commercial Cleaning Services & Companies, Springfield
- Industrial & Commercial Real Estate, Springfield
- Industrial & Heavy Equipment Repair & Service, Springfield
- Industrial Contractors, Springfield
- Industrial Equipment & Machinery, Springfield
- Industrial Goods & Products - Hard Goods - Large, Springfield
- Industrial Goods & Products - Hard Goods - Small, Springfield
- Industrial Goods & Products - Soft - Large & Small, Springfield
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Springfield
- Industry, Springfield
- Information Technology Services, Springfield - IT Service
- Inspection & Testing Services, Springfield
- Insurance Adjusters, Springfield
- Insurance Adjusters Public, Springfield
- Insurance Carriers, Springfield
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- Insurance Carriers By Specialty, Springfield
- Insurance Claim Processing Services, Springfield
- Insurance Consulting & Information Services, Springfield
- Insurance Farm, Springfield
- Insurance General Liability, Springfield
- Insurance Motorcycles, Springfield
- Insurance Real Property, Springfield
- Insurance Renters, Springfield
- Insurance Services, Springfield
- Interior Designers & Decorators, Springfield
- Internal Medicine Doctors, Springfield - Internists Physicians & Surgeons
- Internet Providers, Springfield
- Internet Services, Springfield
- Investment Bankers, Springfield
- Investment Management Services, Springfield
- Investment Services & Advisors, Springfield
- Italian Foods, Springfield
- Italian Restaurants, Springfield
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