In the above map, from howmoneywalks.com, Fairfax County is bright red because since 1993 taxpayers with Average Gross Income (AGI) totaling over $6 billion have left Fairfax County. Most have moved to neighboring Loudoun and Prince William counties, which are bright green. Counties in green have had a net gain of taxpayers.
Meanwhile, between 2000 and 2011 the number of Fairfax County residents living in poverty increased 70 percent, from 43,396 to 73,794 (U.S. Census Bureau, 2000 Decennial Census and 2011 American Community Survey).
But the state of Virginia had a net gain of $3.30 billion in annual AGI. The breakdown for both Virginia and Fairfax County are shown below.
Virginia Gained Wealth From: Virginia Lost Wealth To: (+$3.30B) $2.37 billion New York $3.12 billion Florida $1.75 billion New Jersey $2.39 billion North Carolina $1.30 billion Maryland $681.10 million South Carolina $1.02 billion District of Columbia $505.47 million Texas $828.23 million Pennsylvania $494.38 million Colorado Fairfax Co Gained Wealth From: Fairfax Co Lost Wealth To: (-$6.03B) $1.52 billion Arlington Co, VA $3.94 billion Loudoun Co, VA $1.26 billion Alexandria City, VA $2.22 billion Prince Wm Co, VA $403.42 million Montgomery Co, MD $1.00 billion Fredericksburg, VA $216.52 million Washington, DC $281.84 million Fauquier Co, VA $102.13 million Los Angeles Co, CA $255.12 million Stafford Co, VA
For more about this topic, read " How Money Walks: How $2 Trillion Moved Between the States, and Why It Matters" by Travis Brown. Also, the National Taxpayers Union has produced a 6-minute youtube video.