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Fairfax County is a county in Northern Virginia, in the United States. As of April 2009[update], the estimated population of the county is 1,037,605[1] making it by far the most populous jurisdiction in the Commonwealth of Virginia, with 13.1% of Virginia’s population, and the most populous jurisdiction in the Washington Metropolitan Area. Fairfax was the first county in the United States to reach a six-figure median household income, and has the second-highest median household income of any county with a population of 250,000 or more in the United States after neighboring Loudoun County.[2]

Prince William County is a county located in the Commonwealth of Virginia, and is part of the Washington Metropolitan Area. The estimated population in 2007 of the county was 383,644, a 36.6% increase since 2000. Its county seat is the independent city of Manassas[1]. It is part of Northern Virginia and is one of the highest-income counties in the United States.

Loudoun County (pronounced “LOUD-un”) is a county located in Northern Virginia, and is part of the Washington Metropolitan Area. As of July 2006, the county is estimated to be home to 268,817 people, a 58% increase over the 2000 figure of 169,599. That increase makes the county the fastest growing in the United States during that period. As of 2007, the town of Leesburg had been county seat for 249 of the last 250 years.