Moorefield is a census-designated place (CDP) in Loudoun County, Virginia, United States. As of the 2020 census, Moorefield had a population of 4,421. As of the 2010 census, the CDP was named Moorefield Station. Moorefield is a mixed-use development currently in progress, located at the Ashburn station at the western terminus of the Metrorail Silver Line.
Moorefield is in the Ashburn portion of eastern Loudoun County, on the southwest side of the Dulles Greenway (Virginia State Route 267). It is bordered to the northeast by Ashburn proper, to the northwest and west by Brambleton, and the south by Loudoun Valley Estates. It is south of Leesburg, the Loudoun county seat, and west-northwest of Washington, D.C.
According to the U.S. Census Bureau, the Moorefield CDP has a total area of , of which , or 0.07%, are water. The area drains southeast toward Broad Run, a north-flowing tributary of the Potomac River.
Moorefield Station was first listed as a census designated place in the 2010 U.S. census.