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Marin County, California Demographics 2026

Marin County, California has a population of 258,765, the 26th most populous county in California. The median household income is $142,785 and the median home value is $1,390,000. The poverty rate is 7.8%.

Marin County Quick Facts

Population 258,765
Median Household Income $142,785
Median Home Value $1,390,000
Poverty Rate 7.8%
Unemployment Rate 6.1%
Median Age 47.3 years
Homeownership Rate 63.9%
Affordability Ratio 9.7x
Bachelor's Degree+ 60.5%
High School Graduation 92.7%
Cities/Places 0
Population 258,765 26th of 58
Median Income $142,785 48% higher state
Poverty Rate 7.8%
Unemployment 6.1%

Economy & Housing

Employment

6.1% Unemployment Rate State: 6.4% | National: 5.2%
62.7% Labor Force Participation

Housing Overview

Owner 63.9%
Renter 36.1%
Affordability Index Very Expensive
9.7x home value to income ratio

People & Demographics

Diversity Index

51out of 100
Moderate Diversity

Moderate diversity with one or two groups making up the majority.

State average: 69 | National average: 60

Education

Explore California Rankings

Cities by Population All cities ranked by size Richest Cities Ranked by median income Most Educated By bachelor's degree rate Most Affordable By housing affordability

Population Overview

Marin County is located in California with a total population of 258,765. It is the 26th most populous county out of 58 in California.

Age Demographics

The median age in Marin County is 47.3 years. This is 26% higher than the state median of 37.6 years. 10.2% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Marin County is $142,785. This is 48% higher than the state median of $96,334. Compared to the national median of $78,538, household income here is 82% higher. The poverty rate stands at 7.8%. This is 35% lower than the state poverty rate of 12.0%. The unemployment rate is 6.1%. This is 5% lower than the state rate of 6.4%. The median home value is $1,390,000. Housing costs are 100% higher than the state median of $695,400. The home-value-to-income ratio of 9.7x suggests that housing affordability is a significant concern for many residents. 63.9% of occupied housing units are owner-occupied. This homeownership rate is 15% higher than the state average of 55.8%.

Race & Ethnicity

The largest racial or ethnic group in Marin County is White (non-Hispanic), making up 66.6% of the population. Hispanic or Latino residents account for 19.0%. The White (non-Hispanic) population is significantly higher than the state average (66.6% vs 34.6%). The Black or African American population (2.1%) is well below the state average of 5.3%. The Hispanic or Latino population (19.0%) is well below the state average of 39.8%. The Asian population (6.1%) is well below the state average of 15.0%.

Education

60.5% of residents aged 25 and older hold a bachelor's degree or higher. This places Marin County in the top 10% of all cities in the state for educational attainment. This is 66% higher than the state rate of 36.5%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.7%. Notably, 27.3% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Frequently Asked Questions

What is the population of Marin County, California?

Marin County has a population of 258,765, making it the 26th most populous county in California.

What is the median income in Marin County?

The median household income in Marin County is $142,785 with a poverty rate of 7.8%.

How many cities are in Marin County, California?

Marin County contains 0 Census-designated places.