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Polk County, IA Population by Age

The median age in Polk County, IA is 36.1, as per 2018-2022 ACS 5 -Year Estimates. Of the total population, 20.40% were under the age of 15, 20.68% aged 15 to 29, 45.40% aged 30 to 64, 12.02% aged 65 to 84, and 1.51% were 85 years of age and older.
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By Neilsberg Research
Updated Jul 26, 2024

Polk County, IA population age distributions

A complete breakdown of Polk 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 32,917 6.67%
5 to 9 years 33,329 6.76%
10 to 14 years 34,365 6.97%
15 to 19 years 32,190 6.52%
20 to 24 years 32,066 6.5%
25 to 29 years 37,790 7.66%
30 to 34 years 37,024 7.5%
35 to 39 years 35,811 7.26%
40 to 44 years 33,589 6.81%
45 to 49 years 29,990 6.08%
50 to 54 years 29,893 6.06%
55 to 59 years 30,002 6.08%
60 to 64 years 27,686 5.61%
65 to 69 years 22,421 4.54%
70 to 74 years 18,283 3.71%
75 to 79 years 11,138 2.26%
80 to 84 years 7,440 1.51%
85 years and over 7,444 1.51%
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Polk County, IA population by age group

Key stats
164,867
Population under 25 years
144,214
Population aged 25-44
117,571
Population aged 45-64
66,726
Population aged 65+

Sources: U.S. Census Bureau, American Community Survey (ACS) 2018-2022

FIGURE 1

Polk County, IA population by age group.

The largest age group is 25 to 29 years with a population of 37,790 (7.66% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.
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The largest age group in Polk County, IA was for the group of age 25 to 29 years with a population of 37,790 (7.66%), according to the 2018-2022 American Community Survey.

At the same time, the smallest age group in Polk County, IA was the 80 to 84 years with a population of 7,440 (1.51%).

Polk County, IA population by age cohort

To better understand the age distribution of Polk County, IA'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

Polk County, IA population by age cohort

The largest age group was 18 to 64 years with a population of 305,995 (62.02% of the total population).

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.
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Polk County, IA population by age cohort

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

Age Group Population % of Total Population
Under 18 years 120,657 24.46%
18 to 64 years 305,995 62.02%
65 years and over 66,726 13.52%
Exploring Polk County's Diversity? Request Customized Data Now!

Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Polk County 's population under 18 was 24.46%, compared to the 22.11% nationwide.
  • Polk County's working population (between 18 and 64) was 62.02%, compared to 61.36% nationwide.
  • Polk County's elderly or the senior population (over 65 age) was 13.52% as compared to 16.53% nationwide.

Polk County, IA population pyramid

Population pyramid for Polk County, IA 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 Polk County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Polk County, IA, is 30.9.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Polk County, IA, is 20.5.
  • Total dependency ratio for Polk County, IA is 51.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Polk County, IA is 4.9.

FIGURE 3

Polk County, IA population pyramid

Polk County population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.

Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.
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Polk County, IA population pyramid

Here's the Polk County, IA's male and female population across different age groups .

Age Group Population(Male) Population(Female) Total Population
Under 5 years 16,741 16,176 32,917
5 to 9 years 16,257 17,072 33,329
10 to 14 years 18,229 16,136 34,365
15 to 19 years 16,259 15,931 32,190
20 to 24 years 15,954 16,112 32,066
25 to 29 years 19,243 18,547 37,790
30 to 34 years 18,894 18,130 37,024
35 to 39 years 17,760 18,051 35,811
40 to 44 years 17,806 15,783 33,589
45 to 49 years 15,274 14,716 29,990
50 to 54 years 15,217 14,676 29,893
55 to 59 years 15,033 14,969 30,002
60 to 64 years 13,336 14,350 27,686
65 to 69 years 10,435 11,986 22,421
70 to 74 years 8,683 9,600 18,283
75 to 79 years 4,538 6,600 11,138
80 to 84 years 2,722 4,718 7,440
85 years and over 2,860 4,584 7,444
Exploring Polk County's Diversity? Request Customized Data Now!

Things to know

What is the population of Polk County, IA under 18?

Polk County's population under the age of 18 is 120,657, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 24.46% of the total resident population of Polk County, IA.

What is the aging population in Polk County, IA?

Polk County's population aged 65 years and above was 66,726. As per the U.S. Census Bureau's American Community Survey, this population is 13.52% of the entire population.

References

Datasets

Explore datasets by year of publication.
2024
Polk County, IA Age Group Population Dataset: A Complete Breakdown of Polk County Age Demographics from 0 to 85 Years and Over, Distributed Across 18 Age Groups // 2024 Edition
Last updated July 24, 2024
ACS
Free
Neilsberg
CSV, JSON
2018-2022
CC BY 4.0
About this dataset

Context

The dataset tabulates the Polk 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 Polk County. The dataset can be utilized to understand the population distribution of Polk County by age. For example, using this dataset, we can identify the largest age group in Polk County.

Key observations

The largest age group in Polk County, IA was for the group of age 25 to 29 years years with a population of 37,790 (7.66%), according to the ACS 2018-2022 5-Year Estimates. At the same time, the smallest age group in Polk County, IA was the 80 to 84 years years with a population of 7,440 (1.51%). Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 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 Polk County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of Polk 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 Polk County Population by Age. You can refer the same here

Polk County, IA Age Cohorts Dataset: Children, Working Adults, and Seniors in Polk County - Population and Percentage Analysis // 2024 Edition
Last updated July 24, 2024
ACS
Free
Neilsberg
CSV, JSON
2018-2022
CC BY 4.0
About this dataset

Context

The dataset tabulates the Polk 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 Polk 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 18 to 64 years with a poulation of 305,995 (62.02% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates.

Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 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 Polk County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in Polk County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the Polk 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 Polk County Population by Age. You can refer the same here

Polk County, IA Population Pyramid Dataset: Age Groups, Male and Female Population, and Total Population for Demographics Analysis // 2024 Edition
Last updated July 24, 2024
ACS
Free
Neilsberg
CSV, JSON
2018-2022
CC BY 4.0
About this dataset

Context

The dataset tabulates the data for the Polk County, IA population pyramid, which represents the Polk County population distribution across age and gender, using estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 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 Polk County, IA, is 30.9.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Polk County, IA, is 20.5.
  • Total dependency ratio for Polk County, IA is 51.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Polk County, IA is 4.9.
Content

When available, the data consists of estimates from the U.S. Census Bureau American Community Survey (ACS) 2018-2022 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 Polk County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the Polk County for the selected age group is shown in the following column.
  • Population (Female): The female population in the Polk County for the selected age group is shown in the following column.
  • Total Population: The total population of the Polk 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 Polk 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.

Explore related topics

Polk County, IA Demographics Polk County, IA Population

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Collection 5 Resources