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

Counties in New Jersey by population under 18, 2025

Ocean County had the highest population under 18 of 21 counties in 2025, at 24.6%. Cape May County had the lowest, at 15.7%. The median was 20% and the figure for New Jersey was 20.9%. Source: the U.S. Census Bureau.

Highest24.6Ocean County
Lowest15.7Cape May County
Median2021 counties
New Jersey20.9History

All counties, 2025

Ocean County: 24.6 %Ocean County24.6Cumberland County: 23.1 %Cumberland County23.1Union County: 23 %Union County23Passaic County: 22.8 %Passaic County22.8Essex County: 22.3 %Essex County22.3Camden County: 21.7 %Camden County21.7Salem County: 21.6 %Salem County21.6Mercer County: 21.1 %Mercer County21.1Gloucester County: 20.4 %Gloucester County20.4Middlesex County: 20.2 %Middlesex County20.2Bergen County: 20 %Bergen County20Somerset County: 20 %Somerset County20Morris County: 19.9 %Morris County19.9Burlington County: 19.9 %Burlington County19.9Monmouth County: 19.8 %Monmouth County19.8Atlantic County: 19.5 %Atlantic County19.5Sussex County: 19.1 %Sussex County19.1Warren County: 19 %Warren County19Hunterdon County: 18.3 %Hunterdon County18.3Hudson County: 18.2 %Hudson County18.2Cape May County: 15.7 %Cape May County15.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1Ocean County24.60 pts
2Cumberland County23.1-0.2 pts
3Union County23-0.2 pts
4Passaic County22.8-0.1 pts
5Essex County22.3-0.3 pts
6Camden County21.7-0.2 pts
7Salem County21.6-0.1 pts
8Mercer County21.1-0.1 pts
9Gloucester County20.4-0.3 pts
10Middlesex County20.2-0.3 pts
11Bergen County20-0.2 pts
12Somerset County20-0.3 pts
13Morris County19.9-0.1 pts
14Burlington County19.9-0.2 pts
15Monmouth County19.8-0.2 pts
16Atlantic County19.5-0.3 pts
17Sussex County19.1-0 pts
18Warren County19-0.2 pts
19Hunterdon County18.3-0.2 pts
20Hudson County18.2-0.4 pts
21Cape May County15.7-0.3 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, 2025) [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, 2025. 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. 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, 2025. 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.

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, 2025 [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 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_jersey_2025,
  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, 2025}},
  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. 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, 2025
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
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-jersey-counties.
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 24.6% in 2025, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Cape May County, with 15.7% in 2025.

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