Marin County, California Age & Gender Distribution (2024)
Population distribution by age and gender for Marin County, California
Marin County, California Age & Gender Statistics (2024)
Total Population
257,969
Median Age
47.4
Male Median
45.9
Female Median
49.0
Marin County, California Population Growth
Marin County, California Demographic Trend
Since 2010, the population of has changed by +3.8%%.
+3.8%% Growth
Marin County, California Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
Marin County, California Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 47.4 | 257,969 |
| 2023 | 47.3 | 258,765 |
| 2022 | 47.4 | 260,485 |
| 2021 | 47.1 | 262,387 |
| 2020 | 47.1 | 259,441 |
| 2019 | 46.8 | 259,943 |
| 2018 | 46.5 | 260,295 |
| 2017 | 46.1 | 260,814 |
| 2016 | 45.7 | 259,358 |
| 2015 | 45.4 | 258,349 |
| 2014 | 45.1 | 256,802 |
| 2013 | 44.8 | 254,643 |
| 2012 | 44.6 | 252,759 |
| 2011 | 44.3 | 250,666 |
| 2010 | 44.0 | 248,601 |
Marin County, California Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 4.4% |
| 5–17 | 15.0% |
| 18–24 | 7.1% |
| 25–34 | 8.5% |
| 35–54 | 26.3% |
| 55–64 | 15.0% |
| 65+ | 23.8% |
Dependency Ratios for Marin County, California
- Total Dependency Ratio:
- 75.9
- Youth Dependency:
- 34.1
- Old-Age Dependency:
- 41.8
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for Marin County, California
The median age in Marin County, California is 47.4 years.
According to latest Census data, the total population of Marin County, California is 257,969.
In Marin County, California, seniors (ages 65+) make up 23.8% of the population, while children under 18 represent 15.0%.
Based on historical data since 2010, the population in Marin County, California is aging.