Northern Virginia is located in the Washington, DC metropolitan area. It has some of the highest income counties in the country. It has some of the highest paying jobs in the country. The area has many federal government employees. But the largest growth in the area has resulted from the technology sector. Northern Virginia, particularly Loudoun County, has the largest data center market in the world. Fairfax County is the largest county in the area. The primary counties include Fairfax, Loudoun, Arlington, Alexandria city, Falls Church city and Prince William. Other counties and independent cities are included on our website.