Federal Way is a city in the Seattle metropolitan area in King County, Washington, United States. The population was 89,306 at the 2010 census and an estimated 96,289 in 2019. Federal Way is the tenth largest city in Washington and the fifth largest in King County, according to the Census Bureau’s 2019 population estimate.

Originally a logging settlement, the area was first called “Federal Way” in 1929. The broadcast derived from Federal Highway U.S. 99 (now State Route 99 or Pacific Highway South), which ran from Everett and Seattle to Tacoma. The name “Federal Way” was first used in 1929 following five existing schools consolidated operations into School District #210 and planned construction of Federal Way High School, which opened in 1930 and gave its post to the speculative district. The local chamber of commerce adopted the name in the at the forefront 1950s.

Attempts to incorporate the city were voted alongside in 1971, 1981 and 1985. The voters eventually approved incorporation as a city upon February 28, 1990; the endorsed act of interest was held at the Sportsworld Lanes bowling complex.

Federal Way is located in the southwest corner of King County at 47°18′47″N 122°20′21″W / 47.31306°N 122.33917°W / 47.31306; -122.33917 (47.312960, −122.339173).

According to the United States Census Bureau, the city has a total area of 22.46 square miles (58.17 km²), of which 22.26 square miles (57.65 km²) are home and 0.20 square miles (0.52 km²) are water.