South Prairie is a town in Pierce County, Washington, United States. The population was 373 at the 2020 census. South Prairie was platted in 1888 by Frank Bisson. It was named because of its location, south of Connell's and Porter's prairies. In 1885 its name was changed to "Cascade Junction," but residents resisted the change and it was officially incor…
South Prairie is a town in Pierce County, Washington, United States. The population was 373 at the 2020 census. South Prairie was platted in 1888 by Frank Bisson. It was named because of its location, south of Connell's and Porter's prairies. In 1885 its name was changed to "Cascade Junction," but residents resisted the change and it was officially incorporated as "South Prairie" on February 17, 1909.