- Ice Cream & Frozen Yogurt, Thurmont
- In-Home Direct Sales, Thurmont
- Industrial & Commercial Cleaning Services & Companies, Thurmont
- Industrial & Commercial Real Estate, Thurmont
- Industrial Contractors, Thurmont
- Industrial Equipment & Machinery, Thurmont
- Industrial Equipment & Systems, Thurmont
- Industrial Goods & Products - Hard Goods - Large, Thurmont
- Industrial Goods & Products - Hard Goods - Small, Thurmont
- Industrial Manufacturers, Thurmont
- Industrial Supply, Parts & Equipment - Miscellaneous, Thurmont
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- Industrial Waste Recycling, Thurmont
- Industry, Thurmont
- Insulation Contractors, Thurmont - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Carriers, Thurmont
- Insurance Farm, Thurmont
- Interior Designers, Thurmont
- Interior Designers & Decorators, Thurmont
- Investment Services & Advisors, Thurmont
- Invitations & Announcements, Thurmont - Baby Announcements, Wedding Invitations, Etc
- Italian Restaurants, Thurmont
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