The Washington–Baltimore combined metropolitan statistical area is a statistical area including the overlapping metropolitan areas of Washington, D.C. and Baltimore. The region includes Central Maryland, Northern Virginia, three counties in the Eastern Panhandle of West Virginia, and one county in south-central Pennsylvania. It is the most educated, highest-income, and third-most populous combined statistical area in the United States behind New York City–Newark, NJ and Los Angeles–Long Beach.
Image: National mall facing east
Fairfax County, officially the County of Fairfax, is a county in the Commonwealth of Virginia. With a population of 1,150,309 as of the 2020 census, it the most populous county in Virginia, the most populous jurisdiction in the Washington metropolitan area, and the most populous location in the Washington–Baltimore combined statistical area. The county seat is Fairfax; however, because it is an independent city under Virginia law, the city of Fairfax is not part of the county.
Image: 2019 06 28 12 14 48 View south along Interstate 495 (Capital Beltway) from the overpass for Virginia State Route 694 (Lewinsville Road) in Mclean, Fairfax County, Virginia, with the skyline of Tysons Corner visible in the distance