St. Johns County, FL Population by Age

The median age in St. Johns County, FL is 43.8, as per 2021 ACS 5-Year Estimates. Of the total population, 17.79% were under the age of 15, 15.30% aged 15 to 29, 46.81% aged 30 to 64, 18.02% aged 65 to 84, and 2.08% were 85 years of age and older.
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Updated Sep 17, 2023

St. Johns County, FL population age distribution

A complete breakdown of St. Johns 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 12,897 4.85%
5 to 9 years 15,779 5.94%
10 to 14 years 18,588 7%
15 to 19 years 17,151 6.45%
20 to 24 years 12,203 4.59%
25 to 29 years 11,314 4.26%
30 to 34 years 13,717 5.16%
35 to 39 years 17,587 6.62%
40 to 44 years 17,731 6.67%
45 to 49 years 18,709 7.04%
50 to 54 years 18,558 6.98%
55 to 59 years 19,519 7.35%
60 to 64 years 18,555 6.98%
65 to 69 years 17,541 6.6%
70 to 74 years 15,683 5.9%
75 to 79 years 9,538 3.59%
80 to 84 years 5,130 1.93%
85 years and over 5,524 2.08%
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St. Johns County, FL population by age group

Key stats
76,618
Population under 25 years
60,349
Population aged 25-44
75,341
Population aged 45-64
53,416
Population aged 65+

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

The graph shows St. Johns County's population by age group, with age group on x-axis and the respective age group's percent of the total population on y-axis
St. Johns County, FL population by age group. The largest age group was 55-59 years with a poulation of 19,519 (7.35% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in St. Johns County, FL was for the group of age 55-59 years with a population of 19,519 (7.35%), according to the 2021 American Community Survey.

At the same time, the smallest age group in St. Johns County, FL was the 80-84 years with a population of 5,130 (1.93%).

St. Johns County, FL population by age cohort

To better understand the age distribution of St. Johns County, FL'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
The pie chart shows St. Johns County's population divided into segments, with each segment representing an age cohort. The area of each segment is in the same proportion of a circle as the population of the cohort is of the total population.
St. Johns County, FL population by age cohorts (Children: Under 18 years; Working population: 18-64 years; Senior population: 65 years or more). The largest age group was 18 - 64 years with a poulation of 154,112 (58.00% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the population for each of the three cohorts.

Age Group Population % of Total Population
Under 18 years 58,196 21.9%
18 to 64 years 154,112 58%
85 years and over 53,416 20.1%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • St. Johns County's population under 18 was 21.90%, compared to the 22.51% nationwide.
  • St. Johns County's working population (between 18 and 64) was 58.00%, compared to 61.45% nationwide.
  • St. Johns County's elderly or the senior population (over 65 age) was 20.10% as compared to 16.04% nationwide.

St. Johns County, FL population pyramid

Population pyramid for St. Johns County, FL 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 St. Johns County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for St. Johns County, FL, is 28.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for St. Johns County, FL, is 32.4.
  • Total dependency ratio for St. Johns County, FL is 61.0.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for St. Johns County, FL is 3.1.
The graph shows St. Johns County's population across different age group and gender, with population on x-axis and population y-axis. The male population is plotted on the left in blue color whereas the female population is plotted on the right in pink color.
St. Johns County, FL population pyramid i.e. St. Johns County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the St. Johns County, FL's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 6,381 6,516 12,897
5 to 9 years 8,135 7,644 15,779
10 to 14 years 9,307 9,281 18,588
15 to 19 years 8,999 8,152 17,151
20 to 24 years 5,953 6,250 12,203
25 to 29 years 5,671 5,643 11,314
30 to 34 years 6,548 7,169 13,717
35 to 39 years 8,119 9,468 17,587
40 to 44 years 9,156 8,575 17,731
45 to 49 years 9,440 9,269 18,709
50 to 54 years 9,189 9,369 18,558
55 to 59 years 9,542 9,977 19,519
60 to 64 years 8,717 9,838 18,555
65 to 69 years 8,561 8,980 17,541
70 to 74 years 7,264 8,419 15,683
75 to 79 years 4,503 5,035 9,538
80 to 84 years 2,186 2,944 5,130
85 years and over 2,366 3,158 5,524
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Things to know

What is the population of St. Johns County, FL under 18?

St. Johns County's population under the age of 18 is 58,196, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.90% of the total resident population of St. Johns County, FL.

What is the aging population in St. Johns County, FL?

St. Johns County's population aged 65 years and above was 53,416. As per the U.S. Census Bureau's American Community Survey, this population is 20.10% of the entire population.

References

Datasets

Explore datasets by year of publication.
2023
St. Johns County, FL Age Group Population Dataset: A complete breakdown of St. Johns County age demographics from 0 to 85 years, distributed across 18 age groups
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the St. Johns County population distribution across 18 age groups. It lists the population in each age group along with the percentage population relative of the total population for St. Johns County. The dataset can be utilized to understand the population distribution of St. Johns County by age. For example, using this dataset, we can identify the largest age group in St. Johns County.

Key observations

The largest age group in St. Johns County, FL was for the group of age 55-59 years with a population of 19,519 (7.35%), according to the 2021 American Community Survey. At the same time, the smallest age group in St. Johns County, FL was the 80-84 years with a population of 5,130 (1.93%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

St. Johns County population by age group

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Age groups:

  • Under 5 years
  • 5 to 9 years
  • 10 to 14 years
  • 15 to 19 years
  • 20 to 24 years
  • 25 to 29 years
  • 30 to 34 years
  • 35 to 39 years
  • 40 to 44 years
  • 45 to 49 years
  • 50 to 54 years
  • 55 to 59 years
  • 60 to 64 years
  • 65 to 69 years
  • 70 to 74 years
  • 75 to 79 years
  • 80 to 84 years
  • 85 years and over

Variables / Data Columns

  • Age Group: This column displays the age group in consideration
  • Population: The population for the specific age group in the St. Johns County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of St. Johns County total population. Please note that the sum of all percentages may not equal one due to rounding of values.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for St. Johns County Population by Age. You can refer the same here

St. Johns County, FL Age Cohorts Dataset: Children, Working Adults, and Seniors in St. Johns County - Population and Percentage Analysis
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the St. Johns County population by age cohorts (Children: Under 18 years; Working population: 18-64 years; Senior population: 65 years or more). It lists the population in each age cohort group along with its percentage relative to the total population of St. Johns County. The dataset can be utilized to understand the population distribution across children, working population and senior population for dependency ratio, housing requirements, ageing, migration patterns etc.

Key observations

The largest age group was $b3_v1 with a poulation of $b3_v2 ($b3_v3 of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

St. Johns County population by age cohort

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Age cohorts:

  • Under 18 years
  • 18 to 64 years
  • 65 years and over

Variables / Data Columns

  • Age Group: This column displays the age cohort for the St. Johns County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in St. Johns County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the St. Johns County is shown in the following column.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for St. Johns County Population by Age. You can refer the same here

St. Johns County, FL Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis
Last updated September 16, 2023
ACS
Free
Neilsberg
CSV, JSON
2017-2021
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the St. Johns County, FL population pyramid, which represents the St. Johns County population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey 5-Year estimates. It lists the male and female population for each age group, along with the total population for those age groups. Higher numbers at the bottom of the table suggest population growth, whereas higher numbers at the top indicate declining birth rates. Furthermore, the dataset can be utilized to understand the youth dependency ratio, old-age dependency ratio, total dependency ratio, and potential support ratio.

Key observations

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for St. Johns County, FL, is 28.6.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for St. Johns County, FL, is 32.4.
  • Total dependency ratio for St. Johns County, FL is 61.0.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for St. Johns County, FL is 3.1.

St. Johns County population pyramid

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Age groups:

  • Under 5 years
  • 5 to 9 years
  • 10 to 14 years
  • 15 to 19 years
  • 20 to 24 years
  • 25 to 29 years
  • 30 to 34 years
  • 35 to 39 years
  • 40 to 44 years
  • 45 to 49 years
  • 50 to 54 years
  • 55 to 59 years
  • 60 to 64 years
  • 65 to 69 years
  • 70 to 74 years
  • 75 to 79 years
  • 80 to 84 years
  • 85 years and over

Variables / Data Columns

  • Age Group: This column displays the age group for the St. Johns County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the St. Johns County for the selected age group is shown in the following column.
  • Population (Female): The female population in the St. Johns County for the selected age group is shown in the following column.
  • Total Population: The total population of the St. Johns County for the selected age group is shown in the following column.

Good to know

Margin of Error

Data in the dataset are based on the estimates and are subject to sampling variability and thus a margin of error. Neilsberg Research recommends using caution when presening these estimates in your research.

Custom data

If you do need custom data for any of your research project, report or presentation, you can contact our research staff at research@neilsberg.com for a feasibility of a custom tabulation on a fee-for-service basis.

Inspiration

Neilsberg Research Team curates, analyze and publishes demographics and economic data from a variety of public and proprietary sources, each of which often includes multiple surveys and programs. The large majority of Neilsberg Research aggregated datasets and insights is made available for free download at https://www.neilsberg.com/research/.

Recommended for further research

This dataset is a part of the main dataset for St. Johns County Population by Age. You can refer the same here

If you're looking for datasets from another year, please feel free to contact us at research@neilsberg.com and we'll be happy to assist you further.

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Neilsberg Research team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.

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