Burien is a suburban city in King County, Washington, United States, located south of Seattle on Puget Sound. As of the 2010 Census, Burien's population was 33,313, which is a 49.7% increase since incorporation in 1993. An annexation in 2010 increased the city's population significantly, and as of 2019 the population was an estimated 51,500. In 2017, the Town Square development in downtown Burien was completed. It includes retail space, condominiums, rental apartments, a senior living center, and a King County Library branch with underground parking. City Hall is located on the top floor of the library building. Town Square Park is at the center of the square and features a spray park for children and a rain garden.