Marin County Population Charts

According to the most recent Marin County California demographics data available from the 2022 Census Bureau released in the American Community Survey in November of 2022, Figure 1 Marin County indicates it has a Population 2021 of 262,387 which is the second smallest when sorted by population of all the other counties in the local area. The county with the highest population in the area is Contra Costa County which depicts a population of 1,161,643 (approximately 4.4 times bigger). Figure 3 uses the Marin County population data for a comparison of the population growth/population change estimates from the years 2010 to 2021 and Marin County California depicts an increase of 9,978 (4%).

The total Marin County California greater area population percent change for all areas for the years from 2010 to 2021 is shown in Figure 4 and for Marin County depicts it has a Population Change of 4.0% which is less than most other counties in the metro area.

Looking at the Marin County population density (measured as people per square mile) and providing comparisons to both the national and state average population density in Figure 5, Marin County California shows it has 504 people per square mile which is less than most other counties in the area. The next higher in terms of population density is Solano County 9.0% larger with population density of 549. The county with the highest population density in the area is San Francisco County which depicts a people per square mile of 18,466 ( very much bigger). Figure 6 provides Marin County demographics for the overall median age for all people in the region and Marin County shows it has a Median Age of 47.1 which is more than all other counties in the greater region. The Marin County California population data for median age broken out by gender for both men versus the median age of women is shown in Figure 7. Marin County California depicts a median age of men about 5.7% smaller as the median age of women.

The next demographic analysis (Figure 8) looks at large generational Marin County population groups (and can be useful internet research for employment related research or identifying areas with retirees). Key findings in this chart includes that Marin County California has the smallest proportion of people less than 20 years of age at 8.5% of the total. Second, it has the smallest proportion of people between 20 and 29 years old at 10.1% of the total. Third, it has the largest proportion of people between 30 and 39 years old at 13.9% of the total and is ranked #1. Also, it has the largest proportion of people between 40 and 49 years old at 15.9% of the total and is ranked #1. In addition, it has the largest proportion of people between 60 and 69 years old at 15.5% of the total and is ranked #1.

Figure 9 illustrates the overall diversity breakdown for Marin County population and ethnicity groups in the area. (note: Hispanic/Latino is broken out separately in the next diagram and also the group denoted as Native ethnicity includes Native American, and Hawaiian and Other Pacific Islander.) Marin County California has the percentage of Black population the second smallest when sorted by people who are white of all the other counties in the surrounding region at 6.1% of the total. Second, it has the smallest proportion of Asian population at 0.5% of the total. Third, it has the smallest proportion of Native population at 15.8% of the total. Figure 10 shows the Marin County California Hispanic (including non Hispanic whites) population household ethnicity in the region and Marin County shows it has a Hispanic or Latino of 16.4% which is the second smallest in order of people who are Hispanic or Latino of all the other counties in the greater region. Figure 11 compares the ratio of the amount of men to the amount of women and depicts total male population only about 3.2% smaller as the total female population.

Marin County Marital Status and Families Charts

Figure 12 shows the detailed marriage characteristics broken down by %residents who are married, never married, single, divorced, and widowed. Marin County has the smallest proportion of total percent married at 29% of the total. Second, it has the largest proportion of never married percent at 13% of the total and is ranked #1. Figure 14 compares the average household size using the average number of people in a family for Marin County households. Marin County depicts it has a Family Size of 3.1 which is the smallest when ranked by average family size of all the other counties in the metro area. The county with the highest average family size in the area is Solano County which depicts an average family size of 3.5 (12.3% larger).

Figure 15 shows the overall ratio of Marin County households for families to the total number of Marin County households and that Marin County depicts it has a Families of 63% which is the second smallest in order of percent of people who are in a family of all the other counties in the greater region. The county with the highest percent of people who are in a family in the area is Contra Costa County which depicts a families percent of 72% (13.4% larger).

Looking at Marin County households that are headed by a husband and wife as a percent of all families in Figure 16, Marin County shows it has a Married-couple family of 81% which is the highest of all counties in the greater Marin County region. Figure 17 shows Marin County demographics for the head of household for each place using a breakdown of married-couple, male-headed alone, and female-headed alone. Marin County California has the smallest proportion of households at 6.0% of the total. Second, it has the smallest proportion of households at 12.9% of the total.

Marin County Mothers and Children Charts

The next section of charts provide a detailed look at mothers and baby births that occurred over the past 12 months. Figure 18 shows the rate of women aged 15 to 50 years old who have given birth. Marin County depicts it has a Birth Rate of 5.0% which is the third most percent of women who have given birth of all other counties in the greater Marin County region. The county with the highest percent of women who gave birth in the area is Solano County which depicts a birth rate of 5.6% (11.9% larger). Figure 19 shows the breakdown of the mother's age for all baby births that occurred in the last 12 months and has the percentage of percent of births to mothers aged 15 to 19 less than most other counties in the local area at 5% of the total. Second, it has the smallest proportion of percent of births to mothers aged 20 to 24 at 6% of the total. Third, it has the largest proportion of percent of births to mothers aged 35 to 39 at 19% of the total and is ranked #1. Also, it has one of the largest proportions of percent of births to mothers aged 40 to 44 at 8% of the total and is ranked #2. The only larger county being Napa County with 10%.

In Figure 20, the demographic data for Marin County California teenager birth rate is shown (women between the ages of 15 and 19.) Marin County depicts it has a Teenager Birth Rate of 1% which is the third most of all other counties in the surrounding region. The county with the highest teenager birth rate in the area is Solano County which shows a births to a teenager of 1% (13.8% larger).

In Figure 21, the percentage of all births in the last 12 months to mothers that were unmarried is shown (unwed mothers.) Marin County depicts it has a Unwed Births of 22% which is less than most other counties in the surrounding region. The county with the highest percent of unwed women who have given birth in the area is Solano County which shows an unwed mother birth rate of 35% (59.7% larger).

The next chart, Figure 22, shows the percentage of unwed mothers who are also on public assistance. Marin County depicts it has a Unwed birth and on public assistance of 2.3% which is the smallest when ranked by percent of unwed women who have given birth and are on public assistance of all the other counties in the greater region. The county with the highest percent of unwed women who have given birth and are on public assistance in the area is Contra Costa County which depicts a percent of unwed women who gave birth and are on public assistance of 16.2% ( considerably bigger).

Unwed mothers who have given birth in the last 12 months are also shown broken down by age group in Figure 24. Marin County California has the smallest proportion of unwed mothers aged 15 to 19 at 32.1% of the total. Second, it has the largest proportion of unwed mothers aged 20 to 34 at 63.8% of the total and is ranked #1. Figure 25 shows the comparative demographic rate of unwed mothers who have given birth in the last 12 months are broken down by racial group (including the Hispanic birth rate.) Marin County California has the percentage of Black unwed birth rate the second smallest when ranked by White unwed birth rate of all the other counties in the local area at 31.1% of the total. Second, it has the largest proportion of Hispanic unwed birth rate at 61.6% of the total and is ranked #1. Third, it has the largest proportion of Native Hawaiian unwed birth rate at 100.0% of the total and is ranked #1.

Figure 26 shows unwed mothers in poverty (based on median household income definition) who have given birth in the last 12 months. Marin County California has one of the largest proportions of unwed births and living below poverty level at 22.6% of the total and is ranked #2. The only larger county being Solano County with 24.7%. Second, it has the smallest proportion of unwed births and living between 100% and 199% of poverty level at 34.8% of the total.

For all births to unwed mothers, Figure 27 breaks down the education level of the mother by less than high school through college and post graduate attainment has the percentage of percent of unwed mothers with less than high school education in the middle range of other counties in the local area at 24% of the total. Second, it has the smallest proportion of percent of unwed mothers who are a high school graduate or equivalent at 24% of the total. Third, it has the largest proportion of percent of unwed mothers with some college or an associates degree at 30% of the total and is ranked #1. Also, it has the largest proportion of percent of unwed mothers with a Bachelors degree at 20% of the total and is ranked #1.

Marin County Marital Status Charts

The next set of demographic data looks at the marital status for Marin County households which is useful for internet research. Figure 28 compares the total number of single people in each area. Marin County depicts it has a Total Single People of 47% which is less than most other counties in the greater region. The county with the highest percent of people who are single for any reason in the area is San Francisco County which shows a percent single of 58% (24.2% larger). Comparing percent of people who are single for any reason to the United States average of 50%, Marin County is about 6.5% smaller. Also, benchmarked against the state of California, percent of people who are single for any reason of 51%, Marin County is about 8.9% smaller.

Figure 30 compares the single people in each area broken down by never married, divorced, and widowed. Marin County California has the largest proportion of percent never married at 13% of the total and is ranked #1. Figure 31 shows the demographics for the number of single men adults in each area broken out by never married, divorced and widowed. Marin County California has one of the largest proportions of men who have never been married at 10% of the total and is ranked #2. The only larger county being Sonoma County with 10%. Second, it has the largest proportion of men who are divorced at 3% of the total and is ranked #1. Figure 32 shows the number of single women adults in each area broken out by never married, divorced and widowed. Marin County California has the largest proportion of women who have never been married at 16% of the total and is ranked #1.

Figure 33 shows the Marin County demographics for the ratio of the number of single men between the age of 18 and 65, in each area, broken down by age group for the Marin County metro area. Marin County California has the smallest proportion of single men 18 to 24 at 14% of the total. Second, it has the smallest proportion of single men 25 to 29 at 10% of the total. Third, it has the second smallest in terms of percent of single men 18 to 24 of all the other counties in the metropolitan area as measured by single men 30 to 34 at 8% of the total. Also, it has the largest proportion of single men 40 to 44 at 8% of the total and is ranked #1. In addition, it has the largest proportion of single men 45 to 49 at 17% of the total and is ranked #1. Furthermore, it has the largest proportion of single men 50 to 60 at 9% of the total and is ranked #1.

Figure 34 shows the Marin County population data for the ratio of the number of single women between the age of 18 and 65, in each area, broken down by age group for the Marin County metro area. Marin County California has the smallest proportion of single women 18 to 24 at 11% of the total. Second, it has the smallest proportion of single women 25 to 29 at 7% of the total. Third, it has the smallest proportion of single women 30 to 34 at 7% of the total. Also, it has the largest proportion of single women 40 to 44 at 9% of the total and is ranked #1. In addition, it has the largest proportion of single women 45 to 49 at 24% of the total and is ranked #1. Furthermore, it has the largest proportion of single women 50 to 60 at 12% of the total and is ranked #1.

Marin County Citizenship Demographics Charts

The next section of demographic information provides detailed data Marin County residents including: immigrants, citizenship, immigration, country of origin, non citizens and more. To start, Figure 35 shows a high level view of citizenship. Marin County California has the percentage of citizens born In US the second smallest when sorted by percent of citizens born In US of all the other counties in the metropolitan area at 9% of the total. Second, it has less than most other counties in the metro area when ranked by citizens by naturalization at 9% of the total. The next chart (Figure 36) shows for all citizens what the original place of birth was for people who were born in a foreign country and it has the largest proportion of birthplace in this state at 13% of the total and is ranked #1. Second, it has the largest proportion of birthplace in northeast US at 11% of the total and is ranked #1.

In Figure 37, the demographic percentage of Marin County residents who were not born in the United States is shown (i.e. percent foreign born.) Marin County shows it has a Percent Foreign Born of 18.5% which is the second smallest when ranked by percent of population who was born in another country of all the other counties in the local area. The county with the highest percent of population who was born in another country in the area is San Mateo County which depicts a percent born outside United States of 35.1% (about twice as large). Comparing percent of population who was born in another country to the United States average of 13.6%, Marin County is 36.0% larger. Also, benchmarked against the state of California, percent of population who was born in another country of 26.5%, Marin County is approximately three-fourths the size.

Figure 39 provides a detailed analysis of non citizens by breaking them into two age groups: Under 18 and over the age of 18. Marin County California depicts a percent of non citizens under 18 years old approximately a tenth the size as the percent of non citizens over 18 years old. Figure 40 provides further information for non citizen age by showing a comparison of the median age for all non citizens immigrants. it has a Non Citizen Median Age of 40.8 which is in the middle range of other counties in the surrounding region. The county with the highest median age of non citizens in the area is Napa County which shows a median age of 44.2 (8.3% larger).

For all foreign born people who have gone through naturalization (the process of becoming a legal U.S. resident citizen), Figure 42 shows the year when they became fully naturalized U.S. citizens. it has one of the largest proportions of people naturalized 2015 or later at 15% of the total and is ranked #2. The only larger county being Sonoma County with 15%. Second, it has the smallest proportion of people naturalized 2005 to 2009 at 13% of the total.

Marin County Birthplace Demographic Charts

Figure 43 displays a map of the globe and shows Marin County demographic information for large regions of the world that people from this place originally came from. Marin County California has the largest proportion of from Europe at 25% of the total and is ranked #1. Second, it has less than most other counties in the local area when ranked by from Asia at 24% of the total. Third, it has one of the largest proportions of from Africa at 3% of the total and is ranked #2. The only larger county being Contra Costa County with 4%.

Figure 44 categorizes the location for where foreign born people originally come from based on very large continental geographic areas. Marin County California has the percentage of from Europe less than most other counties in the metro area at 24% of the total.

Figure 45 is a table that breaks out all the people who were foreign born by which large geographic region where they were born. Marin County California has the largest proportion of people who were born in Northern Europe at 10.4% of the total and is ranked #1. Second, it has the largest proportion of people who were born in Western Europe at 7.2% of the total and is ranked #1. Third, it has the largest proportion of people who were born in Southern Europe at 3.0% of the total and is ranked #1. Also, it has the smallest proportion of people who were born in South East Asia at 6.4% of the total. In addition, it has the largest proportion of people who were born in Western Asia at 2.7% of the total and is ranked #1. Furthermore, it has the largest proportion of people who were born in Southern Africa at 1.4% of the total and is ranked #1. Next it has the largest proportion of people who were born in the Caribbean at 1.1% of the total and is ranked #1. Additionally, it has the largest proportion of people who were born in South America at 8.7% of the total and is ranked #1. And then, it has the largest proportion of people who were born in North America at 4.8% of the total and is ranked #1.