Falmouth is a census-designated place (CDP) in Stafford County, Virginia, United States. Situated on the north bank of the Rappahannock River at the falls, the community is north of and opposite the city of Fredericksburg. Recognized by the U.S. Census Bureau as a census-designated place (CDP), Falmouth's population was 4,956 as of the 2020 census.

Stafford County is located in the Commonwealth of Virginia. It is a suburb outside of Washington D.C. It is approximately 40 miles (64 km) south of D.C. It is part of the Northern Virginia region, and the D.C. area. It is one of the fastest growing, and highest-income counties in America. As of the 2020 census, the population sits at 156,927. Its county seat is Stafford.