- Ice Cream & Frozen Desserts, Gaithersburg
- Ice Cream & Frozen Yogurt, Gaithersburg
- Ice Making Equipment, Gaithersburg - Ice Machines
- Ignition Apparatus Manufacturers, Gaithersburg
- Image Processing Supplies & Equipment, Gaithersburg
- Immigration And Naturalization Attorneys & Lawyers, Gaithersburg
- Immigration Attorneys & Lawyers, Gaithersburg - Naturalization
- Immigration Lawyers & Attorneys, Gaithersburg - Naturalization
- Importers, Gaithersburg
- Imprinting & Embossing Services, Gaithersburg
- In Home Services, Gaithersburg
- Independent Church, Gaithersburg
- Indian Goods & Products Stores, Gaithersburg
- Indian Restaurants, Gaithersburg
- Individual & Family Information & Referral Services, Gaithersburg
- Individual Retirement Accounts (I R A), Gaithersburg
- Industrial & Commercial Cleaning Services & Companies, Gaithersburg
- Industrial & Commercial Real Estate, Gaithersburg
- Industrial & Heavy Equipment Repair & Service, Gaithersburg
- Industrial & Heavy Vehicle Dealers, Gaithersburg
- Industrial & Personal Service Paper, Boxes & Cardboard, Gaithersburg
- Industrial Contractors, Gaithersburg
- Industrial Engineers & Designers, Gaithersburg - Architectural Designers
- Industrial Equipment & Machinery, Gaithersburg
- Industrial Equipment & Systems, Gaithersburg
- Industrial Goods & Products - Hard Goods - Large, Gaithersburg
- Industrial Goods & Products - Hard Goods - Small, Gaithersburg
- Industrial Goods & Products - Soft - Large & Small, Gaithersburg
- Industrial Heaters & Boilers, Gaithersburg
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Gaithersburg
- Industrial Pumps, Gaithersburg - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Gaithersburg
- Industrial Trucks, Gaithersburg
- Industry, Gaithersburg
- Information Bureaus & Services, Gaithersburg
- Information Retrieval Services, Gaithersburg
- Information Technology Services, Gaithersburg - IT Service
- Inks, Gaithersburg
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- Inks Manufacturing Materials, Gaithersburg - Inks Manufacturers Equipment
- Inspection & Testing Services, Gaithersburg
- Insulation & Energy Conservation Materials, Gaithersburg
- Insulation Contractors, Gaithersburg - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Gaithersburg
- Insurance Carriers, Gaithersburg
- Insurance Carriers By Specialty, Gaithersburg
- Insurance Claim Processing Services, Gaithersburg
- Insurance Consulting & Information Services, Gaithersburg
- Insurance Farm, Gaithersburg
- Insurance General Liability, Gaithersburg
- Insurance Motorcycles, Gaithersburg
- Insurance Recreational, Gaithersburg
- Insurance Renters, Gaithersburg
- Insurance Services, Gaithersburg
- Intercom Systems & Services, Gaithersburg
- Interdenominational Church, Gaithersburg
- Interior Designers, Gaithersburg
- Interior Designers & Decorators, Gaithersburg
- Internal Medicine Doctors, Gaithersburg - Internists Physicians & Surgeons
- International Restaurants, Gaithersburg
- Internet Development, Gaithersburg
- Internet Entertainment, Gaithersburg - Internet Services
- Internet Home Page Development & Consulting, Gaithersburg
- Internet Marketing & Advertising Services, Gaithersburg
- Internet Products - Hardware & Software Providers, Gaithersburg
- Internet Providers, Gaithersburg
- Internet Services, Gaithersburg
- Internet Services E Mail Providers, Gaithersburg
- Internet Websites, Gaithersburg - Web Hosting, etc
- Investment Bankers, Gaithersburg
- Investment Management Services, Gaithersburg
- Investment Services & Advisors, Gaithersburg
- Investments & Mutual Funds, Gaithersburg
- Iron, Steel & Metal Fabricators, Gaithersburg - Fabrication Companies
- Islamic Church, Gaithersburg
- Italian Food Products, Gaithersburg
- Italian Restaurants, Gaithersburg
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