- Ice Cream & Frozen Desserts, Wallingford
- Ice Cream & Frozen Yogurt, Wallingford
- Importers, Wallingford
- Imprinting & Embossing Services, Wallingford
- In Home Services, Wallingford
- Indian Goods & Products Stores, Wallingford
- Industrial & Commercial Cleaning Services & Companies, Wallingford
- Industrial & Commercial Real Estate, Wallingford
- Industrial & Heavy Equipment Repair & Service, Wallingford
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Wallingford
- Industrial & Heavy Vehicle Dealers, Wallingford
- Industrial Contractors, Wallingford
- Industrial Engines, Wallingford
- Industrial Equipment & Machinery, Wallingford
- Industrial Goods & Products - Hard Goods - Large, Wallingford
- Industrial Goods & Products - Hard Goods - Small, Wallingford
- Industrial Goods & Products - Soft - Large & Small, Wallingford
- Industrial Heaters & Boilers, Wallingford
- Industrial Lifts, Wallingford
- Industrial Machinery Manufacturers, Wallingford
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Wallingford
- Industrial Maintenance & Cleaning Contractors, Wallingford
- Industrial Piping Process, Wallingford
- Industrial Pump Repair & Service, Wallingford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Wallingford - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Regulators, Wallingford
- Industrial Supply, Parts & Equipment - Miscellaneous, Wallingford
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- Industry, Wallingford
- Information Bureaus, Wallingford
- Information Bureaus & Services, Wallingford
- Information Processing & Retrieval Systems, Wallingford
- Information Retrieval Services, Wallingford
- Inspection & Testing Services, Wallingford
- Instruments & Control Equipment, Wallingford
- Insulation & Energy Conservation Materials, Wallingford
- Insurance Adjusters, Wallingford
- Insurance Brokers, Wallingford
- Insurance Carriers, Wallingford
- Insurance Farm, Wallingford
- Insurance General Liability, Wallingford
- Insurance Major Medical, Wallingford
- Insurance Motorcycles, Wallingford
- Insurance Renters, Wallingford
- Insurance Services, Wallingford
- Interdenominational Church, Wallingford
- Interior Designers & Decorators, Wallingford
- Internal Medicine Doctors, Wallingford - Internists Physicians & Surgeons
- Internet Marketing & Advertising Services, Wallingford
- Internet Providers, Wallingford
- Internet Services, Wallingford
- Investment Management Services, Wallingford
- Investment Services & Advisors, Wallingford
- Iron, Steel & Metal Fabricators, Wallingford - Fabrication Companies
- Italian Restaurants, Wallingford
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