- Industrial & Commercial Cleaning Services & Companies, Stittsville
- Industrial & Commercial Real Estate, Stittsville
- Industrial & Personal Service Paper, Boxes & Cardboard, Stittsville
- Industrial Contractors, Stittsville
- Industrial Equipment & Machinery, Stittsville
- Industrial Goods & Products - Hard Goods - Large, Stittsville
- Industrial Goods & Products - Hard Goods - Small, Stittsville
- Industrial Goods & Products - Soft - Large & Small, Stittsville
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Stittsville
- Industrial Pumps, Stittsville - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pump, etc
- Industrial Supply, Parts & Equipment - Miscellaneous, Stittsville
- Industry, Stittsville
- Information Retrieval Services, Stittsville
- Inks, Stittsville
- Inks - Manufacturing, Stittsville
- Inspection & Testing Services, Stittsville
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- Insulation Contractors, Stittsville - Blown-In, Spray Foam, Batt, Fiberglass, Attic Insulation Installation & Service
- Insurance Brokers, Stittsville
- Insurance Carriers, Stittsville
- Insurance Carriers By Specialty, Stittsville
- Insurance Farm, Stittsville
- Insurance General Liability, Stittsville
- Insurance Services, Stittsville
- Insurance Travel, Stittsville
- Interior Designers, Stittsville
- Interior Designers & Decorators, Stittsville
- Interlocking Stone, Stittsville
- Internet Products - Hardware & Software Providers, Stittsville
- Internet Services, Stittsville
- Investment Management Services, Stittsville
- Investment Services & Advisors, Stittsville
- Italian Restaurants, Stittsville
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