- Ice Cream & Frozen Yogurt, Waupaca
- Ice Rinks, Waupaca
- Individual & Family Services, Waupaca
- Industrial & Commercial Cleaning Services & Companies, Waupaca
- Industrial & Commercial Real Estate, Waupaca
- Industrial & Heavy Equipment Repair & Service, Waupaca
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Waupaca
- Industrial Contractors, Waupaca
- Industrial Engineers & Designers, Waupaca - Architectural Designers
- Industrial Filters, Waupaca
- Industrial Goods & Products - Hard Goods - Large, Waupaca
- Industrial Goods & Products - Hard Goods - Small, Waupaca
- Industrial Goods & Products - Soft - Large & Small, Waupaca
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Waupaca
- Industrial Supply, Parts & Equipment - Miscellaneous, Waupaca
- Industrial Waste Disposal, Waupaca
- Industry, Waupaca
- Information Bureaus & Services, Waupaca
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- Inspection & Testing Services, Waupaca
- Insurance Carriers, Waupaca
- Insurance Farm, Waupaca
- Insurance Services, Waupaca
- Insurance Underwriters, Waupaca
- Interdenominational Church, Waupaca
- Interior Designers, Waupaca
- Interior Designers & Decorators, Waupaca
- Interior Designers Professional, Waupaca
- Internet Marketing & Advertising Services, Waupaca
- Internet Services, Waupaca
- Invention Marketing Services, Waupaca
- Investment Management Services, Waupaca
- Investment Services & Advisors, Waupaca
- Iron, Steel & Metal Fabricators, Waupaca - Fabrication Companies
- Irrigation Systems & Equipment, Waupaca
- Italian Restaurants, Waupaca
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