Sierra Madre
- County:
- Los Angeles County
- County Seat:
- No
- Area (mi²):
- 2.951
- State:
- California
Sierra Madre is a city located in Los Angeles County, California. Sierra Madre has a 2026 population of 10,775. Sierra Madre is currently declining at a rate of -0.17% annually and its population has decreased by -4.1% since the most recent census, which recorded a population of 11,236 in 2020.