- Independent Church, Hillsboro
- Industrial & Commercial Cleaning Services & Companies, Hillsboro
- Industrial & Heavy Equipment Repair & Service, Hillsboro
- Industrial & Heavy Vehicle Dealers, Hillsboro
- Industrial Contractors, Hillsboro
- Industrial Goods & Products - Hard Goods - Large, Hillsboro
- Industrial Goods & Products - Hard Goods - Small, Hillsboro
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Hillsboro
- Industrial Trucks, Hillsboro
- Industry, Hillsboro
- Information Bureaus & Services, Hillsboro
- Insulation Contractors, Hillsboro - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Hillsboro
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- Insurance Carriers By Specialty, Hillsboro
- Insurance Consulting & Information Services, Hillsboro
- Insurance Crop, Hillsboro
- Insurance Farm, Hillsboro
- Insurance Personal, Hillsboro
- Insurance Services, Hillsboro
- Internet Providers, Hillsboro
- Internet Services, Hillsboro
- Investment Management Services, Hillsboro
- Investment Services & Advisors, Hillsboro
- Iron, Steel & Metal Fabricators, Hillsboro - Fabrication Companies
- Italian Restaurants, Hillsboro
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