Auburn
- County:
- King County
- County Seat:
- No
- Area (mi²):
- 29.824
- State:
- Washington
Auburn is a city located in King County, Washington. Auburn has a 2026 population of 85,513. Auburn is currently growing at a rate of 0.78% annually but its population has decreased by -1.76% since the most recent census, which recorded a population of 87,045 in 2020.