
Simi Valley
- County:
- Ventura County
- County Seat:
- No
- Area (mi²):
- 41.542
- State:
- California
Simi Valley is a city located in Ventura County, California. Simi Valley has a 2025 population of 124,293. Simi Valley is currently declining at a rate of -0.33% annually and its population has decreased by -1.62% since the most recent census, which recorded a population of 126,343 in 2020.
The average household income in Simi Valley is $149,820 with a poverty rate of 6.69%. The median age in Simi Valley is 41.8 years: 40.8 years for males, and 43.1 years for females.