- Ice Cream & Frozen Yogurt, Beltsville
- Ice Machine & Equipment, Beltsville
- Ice Making Equipment, Beltsville - Ice Machines
- Ice Melting Equipment & Supplies, Beltsville
- Importers, Beltsville
- Imprinting & Embossing Services, Beltsville
- Indian Restaurants, Beltsville
- Industrial & Commercial Cleaning Services & Companies, Beltsville
- Industrial & Commercial Real Estate, Beltsville
- Industrial & Heavy Equipment Repair & Service, Beltsville
- Industrial & Personal Service Paper, Boxes & Cardboard, Beltsville
- Industrial Contractors, Beltsville
- Industrial Equipment & Machinery, Beltsville
- Industrial Goods & Products - Hard Goods - Large, Beltsville
- Industrial Goods & Products - Hard Goods - Small, Beltsville
- Industrial Goods & Products - Soft - Large & Small, Beltsville
- Industrial Hygiene Consultants, Beltsville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Beltsville
- Industrial Supply, Parts & Equipment - Miscellaneous, Beltsville
- Industrial Tanks, Beltsville
- Industrial Waste Disposal, Beltsville
- Industrial Waste Recycling, Beltsville
- Industry, Beltsville
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- Information Bureaus & Services, Beltsville
- Information Technology Services, Beltsville - IT Service
- Inspection & Testing Services, Beltsville
- Insurance Brokers, Beltsville
- Insurance Carriers, Beltsville
- Insurance Claim Processing Services, Beltsville
- Insurance Consulting & Information Services, Beltsville
- Insurance Farm, Beltsville
- Insurance General Liability, Beltsville
- Insurance Motorcycles, Beltsville
- Insurance Renters, Beltsville
- Insurance Services, Beltsville
- Intercom Systems & Services, Beltsville
- Interdenominational Church, Beltsville
- Interior Designers, Beltsville
- Interior Designers & Decorators, Beltsville
- International Restaurants, Beltsville
- Internet Products - Hardware & Software Providers, Beltsville
- Internet Services, Beltsville
- Investment Bankers, Beltsville
- Investment Services & Advisors, Beltsville
- Invitations & Envelopes, Beltsville
- Italian Restaurants, Beltsville
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