La Casita-Garciasville is located at (26.326127, -98.707054) [REF].
According to the United States Census Bureau, the CDP has a total area of 4.4 square miles (11.3 km²), of which 4.3 square miles (11.2 km²) is land and 0.04 square mile (0.1 km²) (0.68%) is water.