Prairie Ridge is a census-designated place (CDP) in Pierce County, Washington, United States. The population was 12,288 at the 2020 census.
Geography
According to the United States Census Bureau, the CDP has a total area of 4.3 square miles (11.1 km<sup>2</sup>), of which, 4.3 square miles (11.0 km<sup>2</sup>) of it is land and 0.23% is water.