Arlington County, Virginia
Arlington County is an urban county of about 206,800 residents in the Commonwealth of Virginia. It is located directly across the Potomac River from Washington, D.C.  Formerly part of the District of Columbia, the land now comprising the county was retroceded to Virginia on July 9, 1846, in an act of Congress that took effect in 1847.
Despite being a county, it is considered a Central City of the Washington Metropolitan Area by the Census Bureau, along with the adjacent cities of Washington and Alexandria, Virginia. At a land area of 26 square miles (67 km2), it is geographically the smallest self-governing county in the United States. 
In 2005 Arlington was ranked first among walkable cities in the United States by the American Podiatric Medical Association. CNN Money ranked Arlington as the most educated city in 2006 with 35.7% of residents having held graduate degrees. BusinessWeek ranked Arlington as the safest city weather a recession in on October 2008 with a 49.4% share of jobs in 'strong industries'. Along with five other Northern Virginia counties, Arlington ranked among the twenty U.S. counties with the highest median household income in 2006.
- Profile. Retrieved on January 1, 2008.
- National Association of Counties. Retrieved on September 1, 2008.
-  Arlington, Virginia VA, profile (Arlington County)
- Some Cities Will Be Safer in a Recession
- Matt Woolsey, America's Richest Counties, Forbes.com, 01.22.08, 6:00 PM ET Forbes.com Web site. Retrieved on 2008-02-08.
- Matt Woolsey, America's Richest Counties, Forbes.com, 01.22.08: Complete List: America's Richest Counties: 9. Arlington County, Va. Forbes.com Web Site. Retrieved on 2008-02-08.