Contra Costa County, California Age & Gender Distribution (2024)
Population distribution by age and gender for Contra Costa County, California
Contra Costa County, California Age & Gender Statistics (2024)
Total Population
1,165,012
Median Age
40.5
Male Median
39.5
Female Median
41.5
Contra Costa County, California Population Growth
Contra Costa County, California Demographic Trend
Since 2010, the population of has changed by +13.7%%.
+13.7%% Growth
Contra Costa County, California Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
Contra Costa County, California Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 40.5 | 1,165,012 |
| 2023 | 40.3 | 1,161,458 |
| 2022 | 40.1 | 1,162,648 |
| 2021 | 39.9 | 1,161,643 |
| 2020 | 39.9 | 1,147,788 |
| 2019 | 39.7 | 1,142,251 |
| 2018 | 39.4 | 1,133,247 |
| 2017 | 39.2 | 1,123,678 |
| 2016 | 39.1 | 1,107,925 |
| 2015 | 38.8 | 1,096,068 |
| 2014 | 38.7 | 1,081,232 |
| 2013 | 38.6 | 1,065,794 |
| 2012 | 38.5 | 1,052,047 |
| 2011 | 38.3 | 1,037,817 |
| 2010 | 38.1 | 1,024,809 |
Contra Costa County, California Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.3% |
| 5–17 | 16.7% |
| 18–24 | 8.0% |
| 25–34 | 12.2% |
| 35–54 | 27.7% |
| 55–64 | 13.0% |
| 65+ | 17.1% |
Dependency Ratios for Contra Costa County, California
- Total Dependency Ratio:
- 64.1
- Youth Dependency:
- 36.1
- Old-Age Dependency:
- 28.1
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for Contra Costa County, California
The median age in Contra Costa County, California is 40.5 years.
According to latest Census data, the total population of Contra Costa County, California is 1,165,012.
In Contra Costa County, California, seniors (ages 65+) make up 17.1% of the population, while children under 18 represent 16.7%.
Based on historical data since 2010, the population in Contra Costa County, California is aging.