- Ice Cream & Frozen Yogurt, Duncanville
- Ignition Apparatus Manufacturers, Duncanville
- In Home Services, Duncanville
- Industrial & Commercial Cleaning Services & Companies, Duncanville
- Industrial & Commercial Real Estate, Duncanville
- Industrial & Personal Service Paper, Boxes & Cardboard, Duncanville
- Industrial Contractors, Duncanville
- Industrial Equipment & Machinery, Duncanville
- Industrial Equipment & Machinery - Other, Duncanville
- Industrial Goods & Products - Hard Goods - Large, Duncanville
- Industrial Goods & Products - Hard Goods - Small, Duncanville
- Industrial Goods & Products - Soft - Large & Small, Duncanville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Duncanville
- Industrial Vehicle Repair, Duncanville
- Industry, Duncanville
- Information Bureaus & Services, Duncanville
- Information Processing & Retrieval Systems, Duncanville
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- Inspection & Testing Services, Duncanville
- Insulation Contractors, Duncanville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insulation Material , Duncanville - Contractors Supplies & Equipment
- Insurance Carriers, Duncanville
- Insurance Farm, Duncanville
- Insurance General Liability, Duncanville
- Insurance Motorcycles, Duncanville
- Insurance Renters, Duncanville
- Insurance Services, Duncanville
- Insurance Underwriters, Duncanville
- Interdenominational Church, Duncanville
- Investment Management Services, Duncanville
- Investment Services & Advisors, Duncanville
- Irrigation Systems & Equipment, Duncanville
- Italian Foods, Duncanville
- Italian Restaurants, Duncanville
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