Simi Valley population
Simi Valley, California had an estimated 124,861 residents on July 1, 2025, the 244th-largest city in the US. That is up 0.5% since the 2010 Census and up 12.2% since 2000.
- Population, July 2025
- 124,861-1.2% since April 2020
- People per sq mile
- 3,00541.5 sq mi of land
- Median age
- 41.917.2% are 65 or older
- Households with kids
- 30.5%with anyone under 18
Population by year, 2000 to 2025
| Year | Population | Change | Basis |
|---|---|---|---|
| 2025 | 124,861 | -488 | Estimate, July 1 |
| 2024 | 125,349 | +226 | Estimate, July 1 |
| 2023 | 125,123 | +68 | Estimate, July 1 |
| 2022 | 125,055 | -779 | Estimate, July 1 |
| 2021 | 125,834 | -541 | Estimate, July 1 |
| 2020 | 126,375 | +693 | April 2020 estimates base |
| 2019 | 125,682 | -272 | Estimate, July 1 |
| 2018 | 125,954 | -149 | Estimate, July 1 |
| 2017 | 126,103 | +201 | Estimate, July 1 |
| 2016 | 125,902 | -84 | Estimate, July 1 |
| 2015 | 125,986 | -52 | Estimate, July 1 |
| 2014 | 126,038 | +250 | Estimate, July 1 |
| 2013 | 125,788 | +480 | Estimate, July 1 |
| 2012 | 125,308 | +380 | Estimate, July 1 |
| 2011 | 124,928 | +691 | Estimate, July 1 |
| 2010 | 124,237 | +1,411 | 2010 Census (April 1) |
| 2009 | 122,826 | +1,516 | Estimate, July 1 |
| 2008 | 121,310 | +1,164 | Estimate, July 1 |
| 2007 | 120,146 | +757 | Estimate, July 1 |
| 2006 | 119,389 | +691 | Estimate, July 1 |
| 2005 | 118,698 | +197 | Estimate, July 1 |
| 2004 | 118,501 | +1,131 | Estimate, July 1 |
| 2003 | 117,370 | +1,549 | Estimate, July 1 |
| 2002 | 115,821 | +2,037 | Estimate, July 1 |
| 2001 | 113,784 | +2,451 | Estimate, July 1 |
| 2000 | 111,333 | April 2000 estimates base |
Year-to-year changes across 2010 and 2020 mix census counts with estimates, so small jumps at those years are partly method changes.
Frequently asked questions
What is the population of Simi Valley in 2025?
The Census Bureau estimates Simi Valley had 124,861 residents on July 1, 2025, making it the 244th-largest city in the US.
Is Simi Valley growing?
Yes. Simi Valley has grown 0.5% since the 2010 Census (124,237 people), and shrunk 1.2% since 2020.
What was the population of Simi Valley in 2000?
About 111,333 (the Census Bureau's April 2000 estimates base). By the 2010 Census it was 124,237.
How dense is Simi Valley?
Simi Valley has about 3,005 people per square mile of land (41.5 square miles).
More about Simi Valley
See cost of living, jobs and commutes in Simi Valley, Simi Valley weather by month, or every Simi Valley ZIP code. For the biggest cities in the country, see the largest US cities.