- Ice Cream & Frozen Desserts, Hyattsville
- Ice Cream & Frozen Yogurt, Hyattsville
- Ice Wholesale, Hyattsville - Dry Ice
- Immigration & Naturalization Consultants, Hyattsville
- Immigration And Naturalization Attorneys & Lawyers, Hyattsville
- Immigration Attorneys & Lawyers, Hyattsville - Naturalization
- Immigration Lawyers & Attorneys, Hyattsville - Naturalization
- Importers, Hyattsville
- In-Home Direct Sales, Hyattsville
- Independent Church, Hyattsville
- Indian Goods & Products Stores, Hyattsville
- Indian Restaurants, Hyattsville
- Industrial & Commercial Cleaning Services & Companies, Hyattsville
- Industrial & Commercial Real Estate, Hyattsville
- Industrial Contractors, Hyattsville
- Industrial Equipment & Machinery, Hyattsville
- Industrial Filters, Hyattsville
- Industrial Goods & Products - Hard Goods - Large, Hyattsville
- Industrial Goods & Products - Hard Goods - Small, Hyattsville
- Industrial Goods & Products - Soft - Large & Small, Hyattsville
- Industrial Heaters & Boilers, Hyattsville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Hyattsville
- Industrial Maintenance & Cleaning Contractors, Hyattsville
- Industrial Pumps, Hyattsville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Hyattsville
- Industrial Waste Disposal, Hyattsville
- Industrial Waste Recycling, Hyattsville
- Industry, Hyattsville
- Information Brokers, Hyattsville
- Information Bureaus & Services, Hyattsville
- Information Consultants, Hyattsville
- Information Retrieval Services, Hyattsville
- Information Technology Services, Hyattsville - IT Service
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- Infrared Spectroscopy Testing Labs, Hyattsville
- Inspection & Testing Services, Hyattsville
- Insulation & Energy Conservation Materials, Hyattsville
- Insulation Contractors, Hyattsville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Adjusters, Hyattsville
- Insurance Brokers, Hyattsville
- Insurance Carriers, Hyattsville
- Insurance Consulting & Information Services, Hyattsville
- Insurance Farm, Hyattsville
- Insurance General Liability, Hyattsville
- Insurance Motorcycles, Hyattsville
- Insurance Renters, Hyattsville
- Insurance Services, Hyattsville
- Insurance Underwriters, Hyattsville
- Intercom Systems & Services, Hyattsville
- Interdenominational Church, Hyattsville
- Interior Designers, Hyattsville
- Interior Designers & Decorators, Hyattsville
- International Restaurants, Hyattsville
- Internet - Voice Application, Hyattsville
- Internet Entertainment, Hyattsville - Internet Services
- Internet Marketing & Advertising Services, Hyattsville
- Internet Products - Hardware & Software Providers, Hyattsville
- Internet Providers, Hyattsville
- Internet Services, Hyattsville
- Internet Websites, Hyattsville - Web Hosting, etc
- Investment Services & Advisors, Hyattsville
- Invitations & Envelopes, Hyattsville
- Iron Work Contractors, Hyattsville
- Iron, Steel & Metal Fabricators, Hyattsville - Fabrication Companies
- Irrigation Systems & Equipment, Hyattsville
- Italian Foods, Hyattsville
- Italian Restaurants, Hyattsville
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