- Ice Cream & Frozen Yogurt, Herndon
- Ice Houses, Herndon
- Image Consultants Personal, Herndon
- Image Processing Supplies & Equipment, Herndon
- Immigration And Naturalization Attorneys & Lawyers, Herndon
- Immigration Attorneys & Lawyers, Herndon - Naturalization
- Immigration Lawyers & Attorneys, Herndon - Naturalization
- Importers, Herndon
- Indian Restaurants, Herndon
- Industrial & Commercial Cleaning Services & Companies, Herndon
- Industrial & Commercial Real Estate, Herndon
- Industrial & Heavy Equipment Repair & Service, Herndon
- Industrial & Heavy Vehicle Dealers, Herndon
- Industrial & Personal Service Paper, Boxes & Cardboard, Herndon
- Industrial Contractors, Herndon
- Industrial Equipment & Machinery, Herndon
- Industrial Equipment & Systems, Herndon
- Industrial Goods & Products - Hard Goods - Large, Herndon
- Industrial Goods & Products - Hard Goods - Small, Herndon
- Industrial Goods & Products - Soft - Large & Small, Herndon
- Industrial Hygiene Consultants, Herndon
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Herndon
- Industrial Pump Repair & Service, Herndon - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industrial Trucks, Herndon
- Industry, Herndon
- Information Brokers, Herndon
- Information Bureaus & Services, Herndon
- Information Consultants, Herndon
- Information Retrieval Services, Herndon
- Information Technology Services, Herndon - IT Service
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- Insurance Adjusters, Herndon
- Insurance Brokers, Herndon
- Insurance Carriers, Herndon
- Insurance Consulting & Information Services, Herndon
- Insurance Farm, Herndon
- Insurance General Liability, Herndon
- Insurance Major Medical, Herndon
- Insurance Motorcycles, Herndon
- Insurance Renters, Herndon
- Insurance Services, Herndon
- Interdenominational Church, Herndon
- Interior Designers, Herndon
- Interior Designers & Decorators, Herndon
- Internal Medicine Doctors, Herndon - Internists Physicians & Surgeons
- International Trade Consultants, Herndon - Foreign Trade
- Internet - Voice Application, Herndon
- Internet Development, Herndon
- Internet Home Page Development & Consulting, Herndon
- Internet Marketing & Advertising Services, Herndon
- Internet Products - Hardware & Software Providers, Herndon
- Internet Providers, Herndon
- Internet Services, Herndon
- Internet Services Domain Registration, Herndon
- Investment Bankers, Herndon
- Investment Management Services, Herndon
- Investment Services & Advisors, Herndon
- Irish Restaurants, Herndon
- Iron Work Contractors, Herndon
- Iron, Steel & Metal Fabricators, Herndon - Fabrication Companies
- Italian Restaurants, Herndon
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