Population
124,861
Simi ValleyCensus, July 2025
From 126,348 in July 2020 to 124,861 in July 2025.
The Census Bureau's estimate of everyone living here on July 1.
Simi Valley by the numbers
Official figures for Simi Valley. Each one shows its date, its source and the area it covers. A figure for a larger area says so.
People
Change in a year
-0.4%
Simi ValleyCensus, 2024 to 2025
Change in the population estimate over one year, from July 1 to July 1, both from the same release.
Change over 5 years
-1.2%
Simi ValleyCensus, 2020 to 2025
Change in the population estimate over five years, from July 1 to July 1, both from the same release.
Sources
- U.S. Census Bureau, Population Estimates, Vintage 2025 · Public domain
Figures are shown as each source publishes them. Survey figures carry a 90% margin of error. A figure for a larger area is labelled with that area.