- Ice Cream & Frozen Yogurt, Duncansville
- Ice Wholesale, Duncansville - Dry Ice
- Independent Church, Duncansville
- Industrial & Commercial Cleaning Services & Companies, Duncansville
- Industrial & Heavy Equipment Repair & Service, Duncansville
- Industrial Contractors, Duncansville
- Industrial Equipment & Machinery, Duncansville
- Industrial Goods & Products - Hard Goods - Large, Duncansville
- Industrial Goods & Products - Hard Goods - Small, Duncansville
- Industrial Goods & Products - Soft - Large & Small, Duncansville
- Industrial Lifts, Duncansville
- Industrial Pump Repair & Service, Duncansville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Duncansville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Duncansville
- Industrial Waste Recycling, Duncansville
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- Industry, Duncansville
- Inspection & Testing Services, Duncansville
- Insurance Carriers, Duncansville
- Insurance Consulting & Information Services, Duncansville
- Insurance General Liability, Duncansville
- Insurance Motorcycles, Duncansville
- Insurance Renters, Duncansville
- Insurance Services, Duncansville
- Investment Management Services, Duncansville
- Investment Services & Advisors, Duncansville
- Investments & Mutual Funds, Duncansville
- Invitations & Announcements, Duncansville - Baby Announcements, Wedding Invitations, Etc
- Iron, Steel & Metal Fabricators, Duncansville - Fabrication Companies
- Italian Restaurants, Duncansville
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