- Ice Wholesale, South Houston - Dry Ice
- Industrial & Commercial Cleaning Services & Companies, South Houston
- Industrial & Heavy Equipment Repair & Service, South Houston
- Industrial Contractors, South Houston
- Industrial Equipment & Machinery, South Houston
- Industrial Goods & Products - Hard Goods - Large, South Houston
- Industrial Goods & Products - Hard Goods - Small, South Houston
- Industrial Goods & Products - Soft - Large & Small, South Houston
- Industrial Heat & Electrical Supplies & Equipment, South Houston
- Industrial Lifts, South Houston
- Industrial Machinery Supplies & Equipment - Leasing & Rental, South Houston
- Industrial Maintenance & Cleaning Contractors, South Houston
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- Industrial Patterns, South Houston
- Industrial Supply, Parts & Equipment - Miscellaneous, South Houston
- Industrial Vehicle Repair, South Houston
- Industry, South Houston
- Information Retrieval Services, South Houston
- Inspection & Testing Services, South Houston
- Insulation & Energy Conservation Materials, South Houston
- Insulation Contractors, South Houston - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, South Houston
- Insurance Services, South Houston
- Investment Services & Advisors, South Houston
- Italian Restaurants, South Houston
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