- Indian Restaurants, Potomac
- Industrial & Commercial Cleaning Services & Companies, Potomac
- Industrial & Commercial Real Estate, Potomac
- Industrial Contractors, Potomac
- Industry, Potomac
- Information Bureaus & Services, Potomac
- Information Technology Services, Potomac - IT Service
- Inspection & Testing Services, Potomac
- Insurance Carriers, Potomac
- Insurance Carriers By Specialty, Potomac
- Insurance Farm, Potomac
- Insurance Real Property, Potomac
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- Intercom Systems & Services, Potomac
- Interior Designers, Potomac
- Interior Designers & Decorators, Potomac
- Internal Medicine Doctors, Potomac - Internists Physicians & Surgeons
- International Trade Consultants, Potomac - Foreign Trade
- Internet Development, Potomac
- Internet Home Page Development & Consulting, Potomac
- Internet Services, Potomac
- Investment Services & Advisors, Potomac
- Invitations & Announcements, Potomac - Baby Announcements, Wedding Invitations, Etc
- Italian Restaurants, Potomac
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