West Falls Church is located at (38.8655595, -77.1876993) [REF].
According to the United States Census Bureau, the CDP has a total area of 5.03 square miles (13.0 km²), of which, 4.99 square miles (12.9 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.77%) is water.