U.S. Route 50 is a transcontinental highway which stretches from Ocean City, Maryland to West Sacramento, California. In the U.S. state of Virginia, US 50 extends 86 miles (138 km) from the border with Washington, D.C. at a Potomac River crossing at Rosslyn in Arlington County to the West Virginia state line near Gore in Frederick County.

Frederick County is located in the Commonwealth of Virginia. As of the 2020 census, the population was 91,419. Its county seat is Winchester. The county was formed in 1743 by the splitting of Orange County. It is Virginia's northernmost county. Frederick County is included in the Winchester, VA-WV Metropolitan Statistical Area, which is also included in the Washington-Baltimore-Northern Virginia, DC-MD-VA-WV-PA Combined Statistical Area.