 As of the 2010 census, the CDP population was 5,517.West Side Highway is located at (46.185921, -122.915505).According to the United States Census Bureau, the CDP has a total area of 2.7 square miles (6.9 km²), of which, 2.5 square miles (6.5 km²) of it is land and 0.2 square miles (0.4 km²) of it (6.01%) is water.