Marin County, CA population age distributions
A complete breakdown of Marin County's age demographics from 0 to 85 years, distributed across 18 age groups is listed in the table below.
| Age Group | Population | % of Total Population |
|---|---|---|
| Under 5 years | 11,385 | 4.37% |
| 5 to 9 years | 13,355 | 5.13% |
| 10 to 14 years | 15,930 | 6.12% |
| 15 to 19 years | 16,040 | 6.16% |
| 20 to 24 years | 12,210 | 4.69% |
| 25 to 29 years | 10,311 | 3.96% |
| 30 to 34 years | 11,785 | 4.52% |
| 35 to 39 years | 14,011 | 5.38% |
| 40 to 44 years | 16,300 | 6.26% |
| 45 to 49 years | 19,056 | 7.32% |
| 50 to 54 years | 20,373 | 7.82% |
| 55 to 59 years | 21,034 | 8.07% |
| 60 to 64 years | 18,304 | 7.03% |
| 65 to 69 years | 17,870 | 6.86% |
| 70 to 74 years | 16,349 | 6.28% |
| 75 to 79 years | 10,958 | 4.21% |
| 80 to 84 years | 7,615 | 2.92% |
| 85 years and over | 7,599 | 2.92% |
TABLE OF CONTENTS
Marin County, CA population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2018-2022
FIGURE 1
Marin County, CA population by age group.
The largest age group is 55 to 59 years with a population of 21,034 (8.07% of the total population).
The largest age group in Marin County, CA was for the group of age 55 to 59 years with a population of 21,034 (8.07%), according to the 2018-2022 American Community Survey.
At the same time, the smallest age group in Marin County, CA was the 85 years and over with a population of 7,599 (2.92%).
Marin County, CA population by age cohort
To better understand the age distribution of Marin County, CA's population, we divided it into the following 3 cohorts:
- Children : Under the age of 18 years
- Adults (working population): Between the age of 18 and 64 years
- Seniors: 65 years and above
FIGURE 2
Marin County, CA population by age cohort
The largest age group was 18 to 64 years with a population of 149,148 (57.26% of the total population).
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Marin County 's population under 18 was 19.56%, compared to the 22.11% nationwide.
- Marin County's working population (between 18 and 64) was 57.26%, compared to 61.36% nationwide.
- Marin County's elderly or the senior population (over 65 age) was 23.18% as compared to 16.53% nationwide.
Marin County, CA population pyramid
Population pyramid for Marin County, CA is charted below using the estimates from U.S. Census Bureau's American Community Survey 5-Year estimates. A wide base suggests population increase, narrow base indicates declining birth rates.
Key stats from our analysis of the Marin County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Marin County, CA, is 25.5.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Marin County, CA, is 37.9.
- Total dependency ratio for Marin County, CA is 63.4.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Marin County, CA is 2.6.
FIGURE 3
Marin County, CA population pyramid
Marin County population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.
Marin County, CA population pyramid
Here's the Marin County, CA's male and female population across different age groups .
| Age Group | Population(Male) | Population(Female) | Total Population |
|---|---|---|---|
| Under 5 years | 5,886 | 5,499 | 11,385 |
| 5 to 9 years | 6,781 | 6,574 | 13,355 |
| 10 to 14 years | 8,141 | 7,789 | 15,930 |
| 15 to 19 years | 8,122 | 7,918 | 16,040 |
| 20 to 24 years | 6,251 | 5,959 | 12,210 |
| 25 to 29 years | 5,501 | 4,810 | 10,311 |
| 30 to 34 years | 6,271 | 5,514 | 11,785 |
| 35 to 39 years | 7,036 | 6,975 | 14,011 |
| 40 to 44 years | 8,276 | 8,024 | 16,300 |
| 45 to 49 years | 9,540 | 9,516 | 19,056 |
| 50 to 54 years | 10,150 | 10,223 | 20,373 |
| 55 to 59 years | 9,918 | 11,116 | 21,034 |
| 60 to 64 years | 9,190 | 9,114 | 18,304 |
| 65 to 69 years | 8,367 | 9,503 | 17,870 |
| 70 to 74 years | 7,415 | 8,934 | 16,349 |
| 75 to 79 years | 5,109 | 5,849 | 10,958 |
| 80 to 84 years | 3,272 | 4,343 | 7,615 |
| 85 years and over | 2,757 | 4,842 | 7,599 |
Things to know
What is the population of Marin County, CA under 18?
Marin County's population under the age of 18 is 50,946, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 19.56% of the total resident population of Marin County, CA.
What is the aging population in Marin County, CA?
Marin County's population aged 65 years and above was 60,391. As per the U.S. Census Bureau's American Community Survey, this population is 23.18% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates