- Ice Cream & Frozen Yogurt, Dublin
- Ice Skating Rinks, Dublin
- Ice Wholesale, Dublin - Dry Ice
- Importers, Dublin
- In Home Services, Dublin
- Indian Restaurants, Dublin
- Individual & Family Information & Referral Services, Dublin
- Industrial & Commercial Cleaning Services & Companies, Dublin
- Industrial & Commercial Real Estate, Dublin
- Industrial & Personal Service Paper, Boxes & Cardboard, Dublin
- Industrial Contractors, Dublin
- Industrial Equipment & Machinery, Dublin
- Industrial Filters, Dublin
- Industrial Goods & Products - Hard Goods - Large, Dublin
- Industrial Goods & Products - Hard Goods - Small, Dublin
- Industrial Goods & Products - Soft - Large & Small, Dublin
- Industrial Heaters & Boilers, Dublin
- Industrial Pumps, Dublin - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Dublin
- Industry, Dublin
- Information Bureaus & Services, Dublin
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- Information Technology Services, Dublin - IT Service
- Inspection & Testing Services, Dublin
- Insulation Contractors, Dublin - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Dublin
- Insurance Carriers, Dublin
- Insurance Consulting & Information Services, Dublin
- Insurance Farm, Dublin
- Insurance General Liability, Dublin
- Insurance Motorcycles, Dublin
- Insurance Renters, Dublin
- Insurance Services, Dublin
- Interior Designers & Decorators, Dublin
- International Restaurants, Dublin
- International Trade Consultants, Dublin - Foreign Trade
- Internet Providers, Dublin
- Internet Services, Dublin
- Investment Management Services, Dublin
- Investment Services & Advisors, Dublin
- Irish Restaurants, Dublin
- Irrigation Systems & Equipment, Dublin
- Italian Restaurants, Dublin
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