San Mateo County, California Age & Gender Distribution (2024)
Population distribution by age and gender for San Mateo County, California
San Mateo County, California Age & Gender Statistics (2024)
Total Population
742,340
Median Age
40.9
Male Median
39.6
Female Median
42.2
San Mateo County, California Population Growth
San Mateo County, California Demographic Trend
Since 2010, the population of has changed by +5.4%%.
+5.4%% Growth
San Mateo County, California Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
San Mateo County, California Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 40.9 | 742,340 |
| 2023 | 40.6 | 745,100 |
| 2022 | 40.3 | 754,250 |
| 2021 | 40.0 | 762,488 |
| 2020 | 39.8 | 765,623 |
| 2019 | 39.7 | 767,423 |
| 2018 | 39.6 | 765,935 |
| 2017 | 39.6 | 763,450 |
| 2016 | 39.5 | 754,748 |
| 2015 | 39.5 | 748,731 |
| 2014 | 39.4 | 739,837 |
| 2013 | 39.3 | 729,543 |
| 2012 | 39.3 | 721,183 |
| 2011 | 39.2 | 711,622 |
| 2010 | 39.0 | 704,327 |
San Mateo County, California Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.1% |
| 5–17 | 14.4% |
| 18–24 | 7.3% |
| 25–34 | 14.2% |
| 35–54 | 28.1% |
| 55–64 | 13.0% |
| 65+ | 17.8% |
Dependency Ratios for San Mateo County, California
- Total Dependency Ratio:
- 59.6
- Youth Dependency:
- 31.2
- Old-Age Dependency:
- 28.4
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for San Mateo County, California
The median age in San Mateo County, California is 40.9 years.
According to latest Census data, the total population of San Mateo County, California is 742,340.
In San Mateo County, California, seniors (ages 65+) make up 17.8% of the population, while children under 18 represent 14.4%.
Based on historical data since 2010, the population in San Mateo County, California is aging.