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Fairfax County is a county in Northern Virginia nicknamed the Silicon Valley of the East Coast due to its heavy concentration of information technology firms. It has an estimated population of over 1,000,000 making it the most populous county in the Commonwealth of Virginia. It has the second highest median household income in the United States.

Geography
Fairfax County is bounded on the north and southeast by the Potomac River; across the river to the northeast is Washington, DC, across the river to the north is Montgomery County, Maryland, across the river to the southeast are Prince George's County, Maryland and Charles County, Maryland; it is also partially bounded on the north and east by Arlington County and the independent cities of Alexandria and Falls Church; it is bound on the west by Loudoun County; and on the south by Prince William County and the independent cities of Manassas and Manassas Park.
The average household size is 2.74 and the average family size is 3.20. The median age is 36 years and the median income for a household in the county is $81,050.

Economy
The economy of Fairfax County is a robust service economy and relies heavily on the Federal Government. Many citizens work for the government or for contractors of the Federal Government. Defense contractors in particular are prominent. The government is the largest employer with Fort Belvoir in southern Fairfax being the county's single largest employer. Tysons Corner is Virginia’s largest office market and one of the leading business centers in the nation with 25.7 million square feet of office space. Several major highways run through Fairfax County including the Capital Beltway (Interstate 495), Interstate 66, Interstate 95, and Interstate 395. Washington Dulles International Airport lies partly within Fairfax County and provides most air service to the county. Two other airports in the Washington area, Ronald Reagan Washington National Airport and Baltimore-Washington International Thurgood Marshall Airport, also serve Fairfax. Fairfax County operates its own bus service called the Fairfax Connector. The Orange, Blue, Yellow and the planned Silver metro lines all serve Fairfax County. In addition, VRE (Virginia Railway Express) also serves Fairfax County with stations in Lorton and Franconia-Springfield.