South Fallsburg is located at (41.716489, -74.630279) [REF].
According to the United States Census Bureau, the CDP has a total area of 6.1 square miles (15.9 km²), of which, 6.0 square miles (15.5 km²) of it is land and 0.1 square miles (0.4 km²) of it (2.28%) is water.