- Ice Cream & Frozen Yogurt, Hummelstown
- In-Home Direct Sales, Hummelstown
- Independent Church, Hummelstown
- Industrial & Commercial Cleaning Services & Companies, Hummelstown
- Industrial Contractors, Hummelstown
- Industrial Equipment & Machinery, Hummelstown
- Industrial Goods & Products - Hard Goods - Large, Hummelstown
- Industrial Goods & Products - Hard Goods - Small, Hummelstown
- Industry, Hummelstown
- Information Bureaus & Services, Hummelstown
- Insulation & Energy Conservation Materials, Hummelstown
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- Insurance Carriers, Hummelstown
- Insurance Farm, Hummelstown
- Interior Designers, Hummelstown
- Interior Designers & Decorators, Hummelstown
- Internet Marketing & Advertising Services, Hummelstown
- Internet Providers, Hummelstown
- Internet Services, Hummelstown
- Investment Management Services, Hummelstown
- Investment Services & Advisors, Hummelstown
- Iron, Steel & Metal Fabricators, Hummelstown - Fabrication Companies
- Italian Restaurants, Hummelstown
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