SeaTac is a city located in Washington. With a 2020 population of 28,890, it is the 40th largest city in Washington and the 1338th largest city in the United States. SeaTac is currently declining at a rate of -0.27% annually but its population has increased by 7.36% since the most recent census, which recorded a population of 26,909 in 2010. SeaTac reached it's highest population of 29,292 in 2017. Spanning over 10 miles, SeaTac has a population density of 2,871 people per square mile.
The average household income in SeaTac is $79,315 with a poverty rate of 12.95%. The median rental costs in recent years comes to $1,286 per month, and the median house value is $321,300. The median age in SeaTac is 35.3 years, 34.4 years for males, and 36.5 years for females. For every 100 females there are 110.4 males.