Thousand Oaks
- County:
- Ventura County
- County Seat:
- No
- Area (mi²):
- 55.257
- State:
- California
Thousand Oaks is a city located in Ventura County, California. Thousand Oaks has a 2026 population of 124,229. Thousand Oaks is currently growing at a rate of 0.12% annually but its population has decreased by -2.04% since the most recent census, which recorded a population of 126,814 in 2020.