Metropolitan Regional Information Systems (MRIS) services the following association

• Anne Arundel County Association of Realtors
• Bay Area Association of Realtors
• Blue Ridge Association of Realtors
• Carroll County Association of Realtors
• Cecil County Board of Realtors
• Dulles Area Association of Realtors
• Eastern Panhandle Board of Realtors
• Frederick County Association of Realtors
• Fredericksburg Area Association of Realtors
• Garrett County Board of Realtors
• Greater Baltimore Board of Realtors
• Greater Capital Area Association of Realtors
• Greater Piedmont Area Association of Realtors
• Harford County Association of Realtors
• Historic Highlands Association of Realtors
• Howard County Association of Realtors
• Maryland Association of Realtors
• Massanutten Association of Realtors
• Mid-Shore Board of Realtors
• Northern Virginia Association of Realtors
• Pen-Mar Regional Association of Realtors
• Potomac Highlands Board of Realtors
• Prince George's County Association of Realtors
• Prince William Association of Realtors
• Southern Maryland Association of Realtors
• Virginia Association of Realtors
• Washington DC Association of Realtors

Metropolitan Regional Information Systems (MRIS) IDX has offered coverage for the following cities (additional Cities may be available):