- Ice Cream & Frozen Yogurt, Houghton
- Industrial & Commercial Cleaning Services & Companies, Houghton
- Industrial & Commercial Real Estate, Houghton
- Industrial & Heavy Equipment Repair & Service, Houghton
- Industrial Contractors, Houghton
- Industrial Equipment & Machinery, Houghton
- Industrial Goods & Products - Hard Goods - Large, Houghton
- Industrial Goods & Products - Hard Goods - Small, Houghton
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Houghton
- Industrial Pump Repair & Service, Houghton - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Vehicle Repair, Houghton
- Industry, Houghton
- Instruments & Control Equipment, Houghton
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- Insulation Contractors, Houghton - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Houghton
- Insurance Carriers, Houghton
- Insurance Compensation, Houghton
- Insurance Farm, Houghton
- Insurance Motorcycles, Houghton
- Insurance Services, Houghton
- Internet Providers, Houghton
- Internet Services, Houghton
- Investment Management Services, Houghton
- Investment Services & Advisors, Houghton
- Iron, Steel & Metal Fabricators, Houghton - Fabrication Companies
- Italian Restaurants, Houghton
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