- Ice Cream & Frozen Yogurt, Sewickley
- Imported Auto Parts, Sewickley
- Industrial & Commercial Cleaning Services & Companies, Sewickley
- Industrial & Commercial Real Estate, Sewickley
- Industrial & Heavy Vehicle Dealers, Sewickley
- Industrial Contractors, Sewickley
- Industrial Engines, Sewickley
- Industrial Goods & Products - Hard Goods - Large, Sewickley
- Industrial Goods & Products - Hard Goods - Small, Sewickley
- Industrial Goods & Products - Soft - Large & Small, Sewickley
- Industrial Trucks, Sewickley
- Industry, Sewickley
- Information Bureaus & Services, Sewickley
- Information Retrieval Services, Sewickley
- Inspection & Testing Services, Sewickley
- Insulation & Energy Conservation Materials, Sewickley
- Insulation Contractors, Sewickley - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insulation Material , Sewickley - Contractors Supplies & Equipment
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- Insurance Brokers, Sewickley
- Insurance Carriers, Sewickley
- Insurance Carriers By Specialty, Sewickley
- Insurance Claim Processing Services, Sewickley
- Insurance Consulting & Information Services, Sewickley
- Insurance Farm, Sewickley
- Insurance General Liability, Sewickley
- Insurance Motorcycles, Sewickley
- Insurance Renters, Sewickley
- Insurance Services, Sewickley
- Interior Designers, Sewickley
- Interior Designers & Decorators, Sewickley
- Internal Medicine Doctors, Sewickley - Internists Physicians & Surgeons
- Internet Services, Sewickley
- Investment Bankers, Sewickley
- Investment Services & Advisors, Sewickley
- Iron, Steel & Metal Fabricators, Sewickley - Fabrication Companies
- Italian Restaurants, Sewickley
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