According to the United States Census Bureau, the CDP has a total area of 5.3 square miles (13.8 km2), of which 5.2 square miles (13.4 km2) are land and 0.2 square miles (0.4 km2), or 2.67%, are water.[2] The namesake Shadow Lake water body is in the western part of the CDP.
Tahoma National Cemetery is located at (47.38722, -122.09354) in the southwest part of the CDP, off SE 240th Street.