- Ice Cream & Frozen Yogurt, Mechanicsburg
- Image Consultants Personal, Mechanicsburg
- Image Processing Supplies & Equipment, Mechanicsburg
- Immigration & Naturalization Consultants, Mechanicsburg
- Immigration & Naturalization Services, Mechanicsburg
- Imported Auto Parts, Mechanicsburg
- Importers, Mechanicsburg
- In Home Services, Mechanicsburg
- Industrial & Commercial Cleaning Services & Companies, Mechanicsburg
- Industrial & Commercial Real Estate, Mechanicsburg
- Industrial & Heavy Equipment Repair & Service, Mechanicsburg
- Industrial & Heavy Equipment Vehicle Rental & Leasing, Mechanicsburg
- Industrial & Heavy Vehicle Dealers, Mechanicsburg
- Industrial & Personal Service Paper, Boxes & Cardboard, Mechanicsburg
- Industrial Contractors, Mechanicsburg
- Industrial Developers, Mechanicsburg
- Industrial Equipment & Machinery, Mechanicsburg
- Industrial Equipment & Systems, Mechanicsburg
- Industrial Filters, Mechanicsburg
- Industrial Goods & Products - Hard Goods - Large, Mechanicsburg
- Industrial Goods & Products - Hard Goods - Small, Mechanicsburg
- Industrial Goods & Products - Soft - Large & Small, Mechanicsburg
- Industrial Heaters & Boilers, Mechanicsburg
- Industrial Hygiene Consultants, Mechanicsburg
- Industrial Lifts, Mechanicsburg
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Mechanicsburg
- Industrial Pump Repair & Service, Mechanicsburg - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Pumps, Mechanicsburg - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Mechanicsburg
- Industrial Trucks, Mechanicsburg
- Industry, Mechanicsburg
- Information Bureaus & Services, Mechanicsburg
- Information Processing & Retrieval Systems, Mechanicsburg
- Information Retrieval Services, Mechanicsburg
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- Information Technology Services, Mechanicsburg - IT Service
- Insecticides, Termite & Pest Control, Mechanicsburg - Pesticides
- Inspection & Testing Services, Mechanicsburg
- Insulation & Energy Conservation Materials, Mechanicsburg
- Insulation Contractors, Mechanicsburg - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Mechanicsburg
- Insurance Brokers, Mechanicsburg
- Insurance Carriers, Mechanicsburg
- Insurance Carriers By Specialty, Mechanicsburg
- Insurance Claim Processing Services, Mechanicsburg
- Insurance Consulting & Information Services, Mechanicsburg
- Insurance Dental, Mechanicsburg
- Insurance Farm, Mechanicsburg
- Insurance General Liability, Mechanicsburg
- Insurance Motorcycles, Mechanicsburg
- Insurance Real Property, Mechanicsburg
- Insurance Renters, Mechanicsburg
- Insurance Services, Mechanicsburg
- Interdenominational Church, Mechanicsburg
- Interior Designers, Mechanicsburg
- Interior Designers & Decorators, Mechanicsburg
- International Affairs, Mechanicsburg
- International Trade Consultants, Mechanicsburg - Foreign Trade
- Internet Access Software & Services, Mechanicsburg
- Internet Development, Mechanicsburg
- Internet Home Page Development & Consulting, Mechanicsburg
- Internet Marketing & Advertising Services, Mechanicsburg
- Internet Providers, Mechanicsburg
- Internet Services, Mechanicsburg
- Investment Management Services, Mechanicsburg
- Investment Services & Advisors, Mechanicsburg
- Iron Work Contractors, Mechanicsburg
- Iron, Steel & Metal Fabricators, Mechanicsburg - Fabrication Companies
- Italian Restaurants, Mechanicsburg
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