Data / Rankings / Population under 18 / Counties in New Jersey

Counties in New Jersey by population under 18

Ocean County had the highest population under 18 of 21 counties in 2021, at 24.3%. Cape May County had the lowest, at 16.9%. The median was 21% and the figure for New Jersey was 21.5%. Source: the U.S. Census Bureau.

Highest24.3Ocean County
Lowest16.9Cape May County
Median2121 counties
New Jersey21.5History

All counties, 2021

Ocean County: 24.3 %Ocean County24.3Cumberland County: 23.5 %Cumberland County23.5Union County: 23.3 %Union County23.3Essex County: 23.1 %Essex County23.1Passaic County: 22.9 %Passaic County22.9Camden County: 22.4 %Camden County22.4Salem County: 22 %Salem County22Mercer County: 21.4 %Mercer County21.4Gloucester County: 21.2 %Gloucester County21.2Middlesex County: 21.1 %Middlesex County21.1Somerset County: 21 %Somerset County21Bergen County: 20.7 %Bergen County20.7Burlington County: 20.6 %Burlington County20.6Morris County: 20.4 %Morris County20.4Atlantic County: 20.4 %Atlantic County20.4Monmouth County: 20.3 %Monmouth County20.3Warren County: 19.7 %Warren County19.7Hudson County: 19.5 %Hudson County19.5Sussex County: 19.2 %Sussex County19.2Hunterdon County: 18.9 %Hunterdon County18.9Cape May County: 16.9 %Cape May County16.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Ocean County24.3+0.1 pts
2Cumberland County23.5+0.1 pts
3Union County23.3-0.3 pts
4Essex County23.1-0.3 pts
5Passaic County22.9-0.3 pts
6Camden County22.4-0.1 pts
7Salem County22+0.1 pts
8Mercer County21.4-0.1 pts
9Gloucester County21.2-0.2 pts
10Middlesex County21.1-0.3 pts
11Somerset County21-0.4 pts
12Bergen County20.7-0.3 pts
13Burlington County20.6-0.2 pts
14Morris County20.4-0.3 pts
15Atlantic County20.4-0.3 pts
16Monmouth County20.3-0.3 pts
17Warren County19.7-0.2 pts
18Hudson County19.5-0.2 pts
19Sussex County19.2-0 pts
20Hunterdon County18.9-0.3 pts
21Cape May County16.9-0.3 pts

Other periods

About this ranking

Residents aged 0 to 17 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (Counties in New Jersey by population under 18, 2021) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in New Jersey by population under 18, 2021. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-under-18/new-jersey-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Counties in New Jersey by population under 18, 2021. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/population-under-18/new-jersey-counties?period=2021.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in New Jersey by population under 18, 2021 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/new-jersey-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_jersey_2021,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in New Jersey by population under 18, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-jersey-counties?period=2021. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in New Jersey by population under 18, 2021
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/population-under-18/new-jersey-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-jersey-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest population under 18?

Ocean County, with 24.3% in 2021, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Cape May County, with 16.9% in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Retrieved 2026-10-12.

Population under 18: other rankings

Counties in New Jersey: more rankings