
Sumner
- County:
- Pierce County
- County Seat:
- No
- Area (mi²):
- 7.532
- State:
- Washington
Sumner is a city located in Pierce County, Washington. Sumner has a 2025 population of 10,987. Sumner is currently growing at a rate of 0.61% annually and its population has increased by 3.15% since the most recent census, which recorded a population of 10,651 in 2020.
The average household income in Sumner is $113,609 with a poverty rate of 7.12%. The median age in Sumner is 35.1 years: 33.3 years for males, and 37.6 years for females.