Auburn
- County:
- Placer County
- County Seat:
- Yes
- Area (mi²):
- 7.177
- State:
- California
Auburn is a city located in Placer County, California. Auburn has a 2026 population of 13,780. It is also the county seat of Placer County. Auburn is currently growing at a rate of 0.56% annually but its population has decreased by -0.1% since the most recent census, which recorded a population of 13,794 in 2020.