Fairfax County, in the Commonwealth of Virginia, has a population of 1,081,726 in 2013, making it the most populous jurisdiction in the Commonwealth of Virginia, with 13.6% of Virginia's population. The county is also the most populous jurisdiction in the DC-VA-MD-WV Metropolitan Statistical Area, with 19.8% of the population. The county seat is Fairfax.
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 local jurisdiction in the United States after neighbor Loudoun County.
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