- Ice Cream & Frozen Yogurt, Springfield
- Ice Sports Clubs & Instruction, Springfield
- Ice Wholesale, Springfield - Dry Ice
- Identification Card Access Services, Springfield
- Immigration And Naturalization Attorneys & Lawyers, Springfield
- Immigration Attorneys & Lawyers, Springfield - Naturalization
- Immigration Lawyers & Attorneys, Springfield - Naturalization
- Imported Auto Parts, Springfield
- Importers, Springfield
- Independent Church, Springfield
- Indian Restaurants, Springfield
- Individual & Family Information & Referral Services, Springfield
- Industrial & Commercial Cleaning Services & Companies, Springfield
- Industrial & Commercial Real Estate, Springfield
- Industrial & Heavy Equipment Repair & Service, Springfield
- Industrial & Heavy Vehicle Dealers, Springfield
- Industrial & Personal Service Paper, Boxes & Cardboard, Springfield
- Industrial Contractors, Springfield
- Industrial Equipment & Machinery, Springfield
- Industrial Equipment & Systems, Springfield
- Industrial Filters, Springfield
- Industrial Goods & Products - Hard Goods - Large, Springfield
- Industrial Goods & Products - Hard Goods - Small, Springfield
- Industrial Goods & Products - Soft - Large & Small, Springfield
- Industrial Heaters & Boilers, Springfield
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Springfield
- Industrial Maintenance & Cleaning Contractors, Springfield
- Industrial Supply, Parts & Equipment - Miscellaneous, Springfield
- Industrial Waste Disposal, Springfield
- Industrial Waste Recycling, Springfield
- Industry, Springfield
- Information Brokers, Springfield
- Information Bureaus & Services, Springfield
- Information Consultants, Springfield
- Information Retrieval Services, Springfield
- Information Technology Services, Springfield - IT Service
- Inspection & Testing Services, Springfield
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- Insulation & Energy Conservation Materials, Springfield
- Insulation Contractors, Springfield - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insulation Materials, Springfield - Foam, Cellulose, Fiberglass, Mineral Wool, Rockwool, etc
- Insurance Adjusters, Springfield
- Insurance Adjusters Public, Springfield
- Insurance Brokers, Springfield
- Insurance Carriers, Springfield
- Insurance Claim Processing Services, Springfield
- Insurance Consulting & Information Services, Springfield
- Insurance Farm, Springfield
- Insurance General Liability, Springfield
- Insurance Motorcycles, Springfield
- Insurance Renters, Springfield
- Insurance Services, Springfield
- Interdenominational Church, Springfield
- Interior Designers, Springfield
- Interior Designers & Decorators, Springfield
- Internal Medicine Doctors, Springfield - Internists Physicians & Surgeons
- International Restaurants, Springfield
- Internet & Online Auctions, Springfield
- Internet Entertainment, Springfield - Internet Services
- Internet Marketing & Advertising Services, Springfield
- Internet Providers, Springfield
- Internet Services, Springfield
- Internet Websites, Springfield - Web Hosting, etc
- Inventory Management Services, Springfield - Inventory Service
- Investment Bankers, Springfield
- Investment Management Services, Springfield
- Investment Services & Advisors, Springfield
- Investments & Mutual Funds, Springfield
- Invitations & Announcements, Springfield - Baby Announcements, Wedding Invitations, Etc
- Irish Restaurants, Springfield
- Irrigation Systems & Equipment, Springfield
- Islamic Church, Springfield
- Italian Food Products, Springfield
- Italian Foods, Springfield
- Italian Restaurants, Springfield
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