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New Castle County, DE Population by Age

The median age in New Castle County, DE is 38.8, as per 2021 ACS 5-Year Estimates. Of the total population, 17.76% were under the age of 15, 20.04% aged 15 to 29, 46.48% aged 30 to 64, 13.89% aged 65 to 84, and 1.83% were 85 years of age and older.
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By Neilsberg Research
Updated Sep 17, 2023

New Castle County, DE population age distribution

A complete breakdown of New Castle 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 31,824 5.61%
5 to 9 years 32,694 5.76%
10 to 14 years 36,337 6.4%
15 to 19 years 38,413 6.77%
20 to 24 years 35,152 6.19%
25 to 29 years 40,207 7.08%
30 to 34 years 40,590 7.15%
35 to 39 years 37,293 6.57%
40 to 44 years 34,588 6.09%
45 to 49 years 35,279 6.21%
50 to 54 years 38,711 6.82%
55 to 59 years 38,855 6.84%
60 to 64 years 38,579 6.79%
65 to 69 years 31,214 5.5%
70 to 74 years 22,263 3.92%
75 to 79 years 15,689 2.76%
80 to 84 years 9,716 1.71%
85 years and over 10,365 1.83%
Exploring New Castle County's Diversity? Request Customized Data Now!

TABLE OF CONTENTS

New Castle County, DE population by age group

Key stats
174,420
Population under 25 years
152,678
Population aged 25-44
151,424
Population aged 45-64
89,247
Population aged 65+

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

The graph shows New Castle 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
New Castle County, DE population by age group. The largest age group was 30-34 years with a poulation of 40,590 (7.15% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in New Castle County, DE was for the group of age 30-34 years with a population of 40,590 (7.15%), according to the 2021 American Community Survey.

At the same time, the smallest age group in New Castle County, DE was the 80-84 years with a population of 9,716 (1.71%).

New Castle County, DE population by age cohort

To better understand the age distribution of New Castle County, DE'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 New Castle 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.
New Castle County, DE 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 355,906 (62.69% 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 122,616 21.6%
18 to 64 years 355,906 62.69%
85 years and over 89,247 15.72%
Exploring New Castle 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:

  • New Castle County's population under 18 was 21.60%, compared to the 22.51% nationwide.
  • New Castle County's working population (between 18 and 64) was 62.69%, compared to 61.45% nationwide.
  • New Castle County's elderly or the senior population (over 65 age) was 15.72% as compared to 16.04% nationwide.

New Castle County, DE population pyramid

Population pyramid for New Castle County, DE 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 New Castle County's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for New Castle County, DE, is 26.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for New Castle County, DE, is 23.6.
  • Total dependency ratio for New Castle County, DE is 50.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for New Castle County, DE is 4.2.
The graph shows New Castle 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.
New Castle County, DE population pyramid i.e. New Castle County population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the New Castle County, DE's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 16,225 15,599 31,824
5 to 9 years 16,754 15,940 32,694
10 to 14 years 18,143 18,194 36,337
15 to 19 years 19,294 19,119 38,413
20 to 24 years 17,720 17,432 35,152
25 to 29 years 20,050 20,157 40,207
30 to 34 years 20,281 20,309 40,590
35 to 39 years 18,849 18,444 37,293
40 to 44 years 16,763 17,825 34,588
45 to 49 years 17,234 18,045 35,279
50 to 54 years 18,626 20,085 38,711
55 to 59 years 19,382 19,473 38,855
60 to 64 years 17,879 20,700 38,579
65 to 69 years 14,408 16,806 31,214
70 to 74 years 10,147 12,116 22,263
75 to 79 years 6,834 8,855 15,689
80 to 84 years 4,003 5,713 9,716
85 years and over 3,777 6,588 10,365
Exploring New Castle County's Diversity? Request Customized Data Now!

Things to know

What is the population of New Castle County, DE under 18?

New Castle County's population under the age of 18 is 122,616, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 21.60% of the total resident population of New Castle County, DE.

What is the aging population in New Castle County, DE?

New Castle County's population aged 65 years and above was 89,247. As per the U.S. Census Bureau's American Community Survey, this population is 15.72% of the entire population.

References

Datasets

Explore datasets by year of publication.
2023
New Castle County, DE Age Group Population Dataset: A complete breakdown of New Castle 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 New Castle 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 New Castle County. The dataset can be utilized to understand the population distribution of New Castle County by age. For example, using this dataset, we can identify the largest age group in New Castle County.

Key observations

The largest age group in New Castle County, DE was for the group of age 30-34 years with a population of 40,590 (7.15%), according to the 2021 American Community Survey. At the same time, the smallest age group in New Castle County, DE was the 80-84 years with a population of 9,716 (1.71%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

New Castle 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 New Castle County is shown in this column.
  • % of Total Population: This column displays the population of each age group as a proportion of New Castle 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 New Castle County Population by Age. You can refer the same here

New Castle County, DE Age Cohorts Dataset: Children, Working Adults, and Seniors in New Castle 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 New Castle 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 New Castle 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.

New Castle 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 New Castle County population analysis. Total expected values are 3 groups ( Children, Working Population and Senior Population).
  • Population: The population for the age cohort in New Castle County is shown in the following column.
  • Percent of Total Population: The population as a percent of total population of the New Castle 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 New Castle County Population by Age. You can refer the same here

New Castle County, DE 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 New Castle County, DE population pyramid, which represents the New Castle 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 New Castle County, DE, is 26.7.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for New Castle County, DE, is 23.6.
  • Total dependency ratio for New Castle County, DE is 50.3.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for New Castle County, DE is 4.2.

New Castle 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 New Castle County population analysis. Total expected values are 18 and are define above in the age groups section.
  • Population (Male): The male population in the New Castle County for the selected age group is shown in the following column.
  • Population (Female): The female population in the New Castle County for the selected age group is shown in the following column.
  • Total Population: The total population of the New Castle 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 New Castle 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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New Castle County, DE Demographics New Castle County, DE Population

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Neilsberg Research
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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Collection 5 Resources