Longview Heights is located at 46°10′56″N 122°57′14″W (46.182099, -122.954006). According to the United States Census Bureau, the CDP has a total area of 4.3 square miles (11.1 km²), of which, 4.2 square miles (11.0 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.93%) is water.