Larkspur
- County:
- Marin County
- County Seat:
- No
- Area (mi²):
- 2.999
- State:
- California
Larkspur is a city located in Marin County, California. Larkspur has a 2026 population of 12,807. Larkspur is currently growing at a rate of 0.8% annually but its population has decreased by -1.75% since the most recent census, which recorded a population of 13,035 in 2020.