Rocklin
- County:
- Placer County
- County Seat:
- No
- Area (mi²):
- 19.81
- State:
- California
Rocklin is a city located in Placer County, California. Rocklin has a 2026 population of 75,129. Rocklin is currently growing at a rate of 1.75% annually and its population has increased by 4.68% since the most recent census, which recorded a population of 71,772 in 2020.