Marin County's estimated 2026 population is 251,684 with a growth rate of -0.79% in the past year according to the most recent United States census data. Marin County is the 26th largest county in California. The 2010 population was 252,906 and has seen a growth of -0.48% since that time.
Data after 2023 is projected based on recent change
Overall: 47.4 years
Female: 49 years
Male: 45.9 years
There are 207,983 adults, (61,345 of whom are seniors) in Marin County.
Female: 131,092 (50.8%)
Male: 126,877 (49.2%)
The racial composition of Marin County includes 67.69% White, 10.7% other race, 6.21% Asian, and smaller percentages for Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 174,615 | 67.69% |
| Two or more races | 31,742 | 12.3% |
| Other race | 27,605 | 10.7% |
| Asian | 16,031 | 6.21% |
| Black or African American | 5,670 | 2.2% |
| Native American | 1,871 | 0.73% |
| Native Hawaiian or Pacific Islander | 435 | 0.17% |
Marin County's average per capita income is $83,637. Household income levels show a median of $149,091. The poverty rate stands at 8.31%.
Name | Median | Mean |
|---|---|---|
| Married Families | $230,954 | $324,790 |
| Families | $199,115 | $288,173 |
| Households | $149,091 | $232,566 |
| Non Families | $81,671 | $126,871 |
Average Income
Median Household Income
Poverty Rate