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Metropolitan Regional Information Systems, Inc. (MRIS) is a leading provider of real estate information technology, and the largest multiple listing service in the nation. MRIS serves more than 40,000 real estate professionals spanning the Mid-Atlantic region, including Maryland, Virginia, Washington, D.C. and parts of Pennsylvania, Delaware and West Virginia.
| Realtor Associations |
| 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 |
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| Cities Covered in DC |
| Deanwood |
| Woodley Park |
| Washington |
| North East |
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