Marin County, California Population 2021

Marin County, California's estimated population is 257,154 with a growth rate of -0.32% in the past year according to the most recent United States census data. Marin County, California is the 27th largest county in California. The 2010 Population was 252,904 and has seen a growth of 1.68% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
2021257,154-836-0.32%
2020257,990-836-0.32%
2019258,826-836-0.32%
2018259,662-87-0.03%
2017259,749-813-0.31%
2016260,562-354-0.14%
2015260,9165570.21%
2014260,3591,9500.75%
2013258,4092,3480.92%
2012256,0616850.27%
2011255,3762,4720.98%
2010252,90422,8089.91%
1990230,0967,5283.38%
1980222,56816,5308.02%
1970206,03859,21840.33%
1960146,82061,20171.48%
195085,61932,71261.83%
194052,90711,25927.03%
193041,64814,30652.32%
192027,3422,2288.87%
191025,1149,41259.94%
190015,7022,63020.12%
189013,0721,74815.44%
188011,3244,42164.04%
18706,9033,569107.05%
18603,3343,011932.20%
18503230.00%
2021 Growth Rate
-0.32%
County Website
County Seat
2010 Population
252,904
Growth (since 2010)
1.68%
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Marin County, California Population Growth

Population by Race

Race Population Percentage
White202,31377.83%
Some Other Race22,2588.56%
Asian15,3675.91%
Two or More Races12,7564.91%
Black or African American5,7672.22%
American Indian and Alaska Native9110.35%
Native Hawaiian and Other Pacific Islander5710.22%
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Marin County, California Population by Race

Marin County, California Population Pyramid 2021

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Marin County, California Median Age

46.8


Total

45.3


Male

48.3


Female

Marin County, California Adults

There are 207,310 adults, (56,170 of whom are seniors) in Marin County, California.

Marin County, California Age Dependency

72

Age Dependency Ratio

37.2

Old Age Dependency Ratio

34.8

Child Dependency Ratio

Marin County, California Sex Ratio

Female

132,987

51.16%

Male

126,956

48.84%

Marin County, California Population by Age

Marin County, California Renter vs Owner Occupied by Household Type

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Marin County, California Household Types

Type Owner Renter
Married76%24%
All63.7%36.3%
Non Family50.8%49.2%
Female50.8%49.2%
Male48.9%51.1%

63.7%

Rate of Home Ownership

Marin County, California Households and Families

Type Count Average Size Owned
All105,4322.463.7
Married54,1743.0276
Non Family39,3801.2950.8
Female8,1023.2450.8
Male3,7763.248.9

2.96

Average Family Size

2.4

Average Household Size

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Marin County, California Households by Type

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Education Attained Count Percentage
Less Than 9th Grade7,5123.95%
9th to 12th Grade5,2472.76%
High School Graduate20,01810.51%
Some College32,48017.06%
Associates Degree11,8726.24%
Bachelors Degree65,37134.33%
Graduate Degree47,90325.16%
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Marin County, California Educational Attainment by Sex (over 25)

Marin County, California Educational Attainment by Race

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Name Total High School Bachelors
White143,886140,75095,647
Hispanic24,11116,1655,760
Asian12,27311,3887,632
Other Race12,1596,8771,609
Multiple Races6,1515,9543,245
Black4,2473,5681,219
Native American65050547
Islander32218212

The highest rate of high school graduation is among white people with a rate of 97.82%.

The highest rate of bachelors degrees is among white people with a rate of 66.47%.

Marin County, California Educational Attainment by Race

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Name Average Male Female
Overall$64,038$80,135$53,250
Less Than High School$24,952$27,071$21,002
High School Grad$35,460$41,934$25,491
Some College$46,816$53,582$39,181
Bachelors Degree$80,372$105,220$61,046
Graduate Degree$103,667$136,907$83,552

$64,038

Average Earnings

$80,135

Average Male

$53,250

Average Female

Marin County, California Earnings by Educational Attainment

Marin County, California Language by Age

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Marin County, California Language

78.12% of Marin County, California residents speak only English, while 21.88% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 11.90% of the population.

Marin County, California Language

Marin County, California Poverty by Race

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Name Total In Poverty Poverty Rate
White182,8238,7324.78%
Hispanic39,5746,69116.91%
Other20,8794,83423.15%
Asian14,8591,2218.22%
Multiple12,1997996.55%
Black4,74679816.81%
Islander50733065.09%
Native82318222.11%

7.23%

Overall Poverty Rate

6.36%

Male Poverty Rate

8.03%

Female Poverty Rate

Poverty in Marin County, California

The race most likely to be in poverty in Marin County, California is Islander, with 65.09% below the poverty level.

The race least likely to be in poverty in Marin County, California is White, with 4.78% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.46%. Among those working part-time, it was 7.98%, and for those that did not work, the poverty rate was 13.41%.

Marin County, California Poverty

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Name Poverty
Less Than High School23.95%
High School10.24%
Some College6.88%
Bachelors or Greater3.64%

Marin County, California Poverty Rate by Education

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Name Poverty
Female Unemployed18.20%
Male Unemployed17.71%
Female Employed4.82%
Male Employed2.65%

Marin County, California Poverty Rate by Employment Status and Sex

Marin County, California Income by Household Type

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Name Median Mean
Households$115,246$176,019
Families$153,656$217,145
Married Families$172,076$241,048
Non Families$62,606$100,366
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Income by Household Type

Marin County, California Marital Status

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Marriage Rates

53.0%

Overall Marriage Rate

56.3%

Male Marriage Rate

49.8%

Female Marriage Rate

Marin County, California Married by Age and Sex

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Marin County, California Marriage

The age group where males are most likely to be married is 45-54, while the female age group most likely to be married is 35-44.

Marin County, California Marital Status by Race

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Marin County, California Marital Status

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10,516

Number of Veterans

9,979

Male Veterans

537

Female Veterans

War Veterans
Vietnam4,377
Korea1,188
Second Gulf War1,136
First Gulf War802
World War II722

Marin County, California Veterans by War

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Age Group Veterans
75+4,277
65 to 743,345
55 to 641,113
35 to 541,060
18 to 34721

Marin County, California Veterans by Age

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Name Veterans % of Total
White8,9545.40%
Hispanic5852.08%
Black4308.85%
Asian3722.77%
2 or More3604.93%
Other3212.19%
Indian7510.96%
Hawaiian41.21%

Marin County, California Veterans by Race

Marin County, California Veterans by Education

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2.64%

Veteran Poverty Rate

27.52%

Veteran Disability Rate

Marin County, California Veterans by Education

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63.7%

Labor Force Participation

61.3%

Employment Rate

3.7%

Unemployment Rate

Marin County, California Employment by Age

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Marin County, California Employment by Race

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Marin County, California Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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50.07%

Born in California

81.88%

Native Born

18.12%

Foreign Born

9.36%

Non Citizen

8.76%

Naturalized

Place of Birth

81.88% of Marin County, California residents were born in the United States, with 50.07% having been born in California. 9.36% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Marin County, California Place of Birth

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources