Maple Valley is a city located in King County Washington. With a 2020 population of 27,542, it is the 41st largest city in Washington and the 1397th largest city in the United States . Maple Valley is currently growing at a rate of 0.62% annually and its population has increased by 21.42% since the most recent census, which recorded a population of 22,684 in 2010. Maple Valley reached it's highest population of 27,542 in 2021. Spanning over 6 miles, Maple Valley has a population density of 4,587 people per square mile.
The average household income in Maple Valley is $126,213 with a poverty rate of 3.46%. The median rental costs in recent years comes to $2,003 per month, and the median house value is $414,400. The median age in Maple Valley is 35.2 years, 34.9 years for males, and 35.6 years for females.