High Quality Content by WIKIPEDIA articles! SeaTac is a city in southern King County, Washington, United States, and an outlying suburb of Seattle. The name of the city is an example of a blend, alluding to the city's location between Seattle and Tacoma, though it is approximately twice as far from downtown Tacoma as it is from downtown Seattle. The population was 25,496 at the 2000 census. SeaTac includes the communities of Angle Lake, Bow Lake, McMicken, and Riverton, which were established before the incorporation of the city. The city hosts the Seattle-Tacoma International Airport and the headquarters of Alaska Airlines and Horizon Air.