Merrifield is a census-designated place (CDP) in Fairfax County, Virginia, United States. The population was 15,212 at the 2010 census. Merrifield is located at 38°52′23″N 77°14′35″W (38.873144, −77.242994). It is bounded by I-66 on the north, the Capital Beltway on the east, Arlington Boulevard on the south, and Nutley Street (Virginia State Highway 243) on the west. According to the United States Census Bureau, the CDP has a total area of 2.7 square miles (7.0 km²), all of it land.