Median Age in Marin County, CA
ACS 2024 5-Year Estimates
How Marin County Compares
National Distribution
Where Marin County falls among all 3,222 U.S. counties for median age.
■ Marin County: 47.4 years
Ranking Context
| Rank | County | Value |
|---|---|---|
| #407 | Clay County, TX | 47.5 years |
| #408 | Oconto County, WI | 47.5 years |
| #409 | Choctaw County, AL | 47.4 years |
| #410 | Marin County, CA | 47.4 years |
| #411 | Putnam County, IL | 47.4 years |
| #412 | Waldo County, ME | 47.4 years |
| #413 | Lac qui Parle County, MN | 47.4 years |
Median Age in Marin County, California
Marin County, California has a median age of 47.4 years, which ranks #410 of 3,222 out of 3,222 counties nationwide. This is 21.9% above the national value of 38.9 years.
Within California, Marin County ranks #10 of 58 out of 58 counties. This places it in the 87th percentile nationally.
The median age of the total population. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.
About this data
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.