Tumwater is a city located in Thurston County Washington. With a 2020 population of 24,742, it is the 45th largest city in Washington and the 1561st largest city in the United States . Tumwater is currently growing at a rate of 1.47% annually and its population has increased by 42.43% since the most recent census, which recorded a population of 17,371 in 2010. Tumwater reached it's highest population of 24,742 in 2021. Spanning over 18 miles, Tumwater has a population density of 1,420 people per square mile.
The average household income in Tumwater is $80,876 with a poverty rate of 8.72%. The median rental costs in recent years comes to $1,196 per month, and the median house value is $286,700. The median age in Tumwater is 37.2 years, 36.3 years for males, and 38.3 years for females.