- Ice Cream & Frozen Yogurt, Louisburg
- Industrial & Commercial Cleaning Services & Companies, Louisburg
- Industrial & Heavy Equipment Repair & Service, Louisburg
- Industrial Contractors, Louisburg
- Industrial Goods & Products - Hard Goods - Large, Louisburg
- Industrial Goods & Products - Hard Goods - Small, Louisburg
- Industrial Supply, Parts & Equipment - Miscellaneous, Louisburg
- Industrial Waste Disposal, Louisburg
- Industrial Waste Recycling, Louisburg
- Industry, Louisburg
- Information Bureaus & Services, Louisburg
- Insulation Contractors, Louisburg - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
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- Insulation Materials, Louisburg - Foam, Cellulose, Fiberglass, Mineral Wool, Rockwool, etc
- Insurance Brokers, Louisburg
- Insurance Carriers, Louisburg
- Insurance Consulting & Information Services, Louisburg
- Insurance Farm, Louisburg
- Insurance Renters, Louisburg
- Insurance Services, Louisburg
- Internal Medicine Doctors, Louisburg - Internists Physicians & Surgeons
- Inventory Management Services, Louisburg - Inventory Service
- Investment Management Services, Louisburg
- Iron, Steel & Metal Fabricators, Louisburg - Fabrication Companies
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