South Hill is a census-designated place (CDP) in Pierce County, Washington, immediately south of Puyallup. The population was 64,708 at time of the 2020 census, up from 52,431 in 2010. The area primarily consists of suburban housing and shopping with several retail shopping centers, residential neighborhoods, and apartment/condo complexes throughout. Because South Hill is unincorporated, its addresses are part of the Puyallup "postal city" or ZCTA.

Pierce County is a county in the U.S. state of Washington. As of the 2020 census, the population was 921,130, up from 795,225 in 2010, making it the second-most populous county in Washington, behind King County, and the 59th-most populous in the United States. The county seat and largest city is Tacoma. Formed out of Thurston County on December 22, 1852, by the legislature of Oregon Territory, it was named for U.S. President Franklin Pierce. Pierce County is in the Seattle metropolitan area.