- Ice Cream & Frozen Desserts, Rockford
- Ice Cream & Frozen Yogurt, Rockford
- Ice Cream Mixes & Other Frozen Mixes, Rockford
- Ice Sports Clubs & Instruction, Rockford
- Ice Wholesale, Rockford - Dry Ice
- Immigration And Naturalization Attorneys & Lawyers, Rockford
- Immigration Attorneys & Lawyers, Rockford - Naturalization
- Immigration Lawyers & Attorneys, Rockford - Naturalization
- Imported Auto Parts, Rockford
- Importers, Rockford
- Independent Church, Rockford
- Indian Restaurants, Rockford
- Individual & Family Information & Referral Services, Rockford
- Industrial & Commercial Cleaning Services & Companies, Rockford
- Industrial & Commercial Real Estate, Rockford
- Industrial & Heavy Equipment Repair & Service, Rockford
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Rockford
- Industrial & Heavy Vehicle Dealers, Rockford
- Industrial & Personal Service Paper, Boxes & Cardboard, Rockford
- Industrial Contractors, Rockford
- Industrial Developers, Rockford
- Industrial Equipment & Machinery, Rockford
- Industrial Equipment & Systems, Rockford
- Industrial Filters, Rockford
- Industrial Furnace, Rockford
- Industrial Goods & Products - Hard Goods - Large, Rockford
- Industrial Goods & Products - Hard Goods - Small, Rockford
- Industrial Goods & Products - Soft - Large & Small, Rockford
- Industrial Heat & Electrical Supplies & Equipment, Rockford
- Industrial Heaters & Boilers, Rockford
- Industrial Lifts, Rockford
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Rockford
- Industrial Maintenance & Cleaning Contractors, Rockford
- Industrial Manufacturers, Rockford
- Industrial Patterns, Rockford
- Industrial Pump Repair & Service, Rockford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Rockford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Rockford
- Industrial Tools, Rockford
- Industrial Trucks, Rockford
- Industrial Waste Disposal, Rockford
- Industrial Waste Recycling, Rockford
- Industrial Waterway & Dock Construction, Rockford
- Industry, Rockford
- Infectious Disease Specialists, Rockford - Doctors, Physicians & Surgeons
- Information & Records Management Services, Rockford
- Information Bureaus, Rockford
- Information Bureaus & Services, Rockford
- Information Processing & Retrieval Systems, Rockford
- Information Retrieval Services, Rockford
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- Information Technology Services, Rockford - IT Service
- Infrared Spectroscopy Testing Labs, Rockford
- Inks, Rockford
- Inks Manufacturing Materials, Rockford - Inks Manufacturers Equipment
- Inspection & Testing Services, Rockford
- Inspection Equipment, Rockford
- Instrument Process Industrial Equipment & Supplies, Rockford
- Instruments & Control Equipment, Rockford
- Insulation & Energy Conservation Materials, Rockford
- Insulation Contractors, Rockford - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Rockford
- Insurance Adjusters Public, Rockford
- Insurance Brokers, Rockford
- Insurance Carriers, Rockford
- Insurance Carriers By Specialty, Rockford
- Insurance Claim Processing Services, Rockford
- Insurance Consulting & Information Services, Rockford
- Insurance Farm, Rockford
- Insurance General Liability, Rockford
- Insurance Major Medical, Rockford
- Insurance Marine, Rockford
- Insurance Medicare, Rockford
- Insurance Motorcycles, Rockford
- Insurance Renters, Rockford
- Insurance Services, Rockford
- Intercom Systems & Services, Rockford
- Interdenominational Church, Rockford
- Interior Designers, Rockford
- Interior Designers & Decorators, Rockford
- Internal Medicine Doctors, Rockford - Internists Physicians & Surgeons
- International Community Of Christ Church, Rockford
- International Trade Consultants, Rockford - Foreign Trade
- Internet & Online Directories, Rockford
- Internet Development, Rockford
- Internet Home Page Development & Consulting, Rockford
- Internet Marketing & Advertising Services, Rockford
- Internet Providers, Rockford
- Internet Services, Rockford
- Internet Services E Mail Providers, Rockford
- Inventory Management Services, Rockford - Inventory Service
- Investment Bankers, Rockford
- Investment Management Services, Rockford
- Investment Services & Advisors, Rockford
- Invitations & Announcements, Rockford - Baby Announcements, Wedding Invitations, Etc
- Irish Restaurants, Rockford
- Iron Work Contractors, Rockford
- Iron, Steel & Metal Fabricators, Rockford - Fabrication Companies
- Irrigation Systems & Equipment, Rockford
- Italian Foods, Rockford
- Italian Restaurants, Rockford
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