Mountainside, NJ Population by Age

The median age in Mountainside, NJ is 51.0, as per 2021 ACS 5-Year Estimates. Of the total population, 18.45% were under the age of 15, 10.18% aged 15 to 29, 43.84% aged 30 to 64, 22.30% aged 65 to 84, and 5.23% were 85 years of age and older.
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Updated Sep 17, 2023

Mountainside, NJ population age distribution

A complete breakdown of Mountainside'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 684 9.77%
5 to 9 years 281 4.01%
10 to 14 years 327 4.67%
15 to 19 years 424 6.05%
20 to 24 years 206 2.94%
25 to 29 years 83 1.19%
30 to 34 years 169 2.41%
35 to 39 years 485 6.93%
40 to 44 years 301 4.3%
45 to 49 years 449 6.41%
50 to 54 years 451 6.44%
55 to 59 years 639 9.12%
60 to 64 years 576 8.23%
65 to 69 years 436 6.23%
70 to 74 years 519 7.41%
75 to 79 years 436 6.23%
80 to 84 years 171 2.44%
85 years and over 366 5.23%
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Mountainside, NJ population by age group

Key stats
1,922
Population under 25 years
1,038
Population aged 25-44
2,115
Population aged 45-64
1,928
Population aged 65+

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

The graph shows Mountainside'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
Mountainside, NJ population by age group. The largest age group was 0-4 years with a poulation of 684 (9.77% of the total population). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

The largest age group in Mountainside, NJ was for the group of age 0-4 years with a population of 684 (9.77%), according to the 2021 American Community Survey.

At the same time, the smallest age group in Mountainside, NJ was the 25-29 years with a population of 83 (1.19%).

Mountainside, NJ population by age cohort

To better understand the age distribution of Mountainside, NJ'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 Mountainside'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.
Mountainside, NJ 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 3,445 (49.19% 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 1,630 23.28%
18 to 64 years 3,445 49.19%
85 years and over 1,928 27.53%
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Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:

  • Mountainside's population under 18 was 23.28%, compared to the 22.51% nationwide.
  • Mountainside's working population (between 18 and 64) was 49.19%, compared to 61.45% nationwide.
  • Mountainside's elderly or the senior population (over 65 age) was 27.53% as compared to 16.04% nationwide.

Mountainside, NJ population pyramid

Population pyramid for Mountainside, NJ 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 Mountainside's population pyramid:

  • Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Mountainside, NJ, is 34.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Mountainside, NJ, is 51.0.
  • Total dependency ratio for Mountainside, NJ is 85.1.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Mountainside, NJ is 2.0.
The graph shows Mountainside'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.
Mountainside, NJ population pyramid i.e. Mountainside population distrubution across age and gender. Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

Here's the Mountainside, NJ's male and female population across different age groups:

Age Group Population(Male) Population(Female) Total Population
Under 5 years 215 469 684
5 to 9 years 189 92 281
10 to 14 years 214 113 327
15 to 19 years 217 207 424
20 to 24 years 126 80 206
25 to 29 years 42 41 83
30 to 34 years 52 117 169
35 to 39 years 254 231 485
40 to 44 years 149 152 301
45 to 49 years 268 181 449
50 to 54 years 272 179 451
55 to 59 years 231 408 639
60 to 64 years 332 244 576
65 to 69 years 122 314 436
70 to 74 years 246 273 519
75 to 79 years 301 135 436
80 to 84 years 72 99 171
85 years and over 122 244 366
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Things to know

What is the population of Mountainside, NJ under 18?

Mountainside's population under the age of 18 is 1,630, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 23.28% of the total resident population of Mountainside, NJ.

What is the aging population in Mountainside, NJ?

Mountainside's population aged 65 years and above was 1,928. As per the U.S. Census Bureau's American Community Survey, this population is 27.53% of the entire population.

References

Datasets

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

Key observations

The largest age group in Mountainside, NJ was for the group of age 0-4 years with a population of 684 (9.77%), according to the 2021 American Community Survey. At the same time, the smallest age group in Mountainside, NJ was the 25-29 years with a population of 83 (1.19%). Source: U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates.

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

Mountainside, NJ Age Cohorts Dataset: Children, Working Adults, and Seniors in Mountainside - 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 Mountainside 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 Mountainside. 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.

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

Mountainside, NJ 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 Mountainside, NJ population pyramid, which represents the Mountainside 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 Mountainside, NJ, is 34.2.
  • Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Mountainside, NJ, is 51.0.
  • Total dependency ratio for Mountainside, NJ is 85.1.
  • Potential support ratio, which is the number of youth (working age population) per elderly, for Mountainside, NJ is 2.0.

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

About the author

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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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