Sumner is a city located in Washington. With a 2020 population of 10,951, it is the 84th largest city in Washington and the 2913th largest city in the United States. Sumner is currently growing at a rate of 2.45% annually and its population has increased by 15.87% since the most recent census, which recorded a population of 9,451 in 2010. Sumner reached it's highest population of 10,951 in 2021. Spanning over 8 miles, Sumner has a population density of 1,454 people per square mile.
The average household income in Sumner is $82,083 with a poverty rate of 12.40%. The median rental costs in recent years comes to $1,194 per month, and the median house value is $333,000. The median age in Sumner is 34.8 years, 34.8 years for males, and 34.8 years for females. For every 100 females there are 82.3 males.