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 2023, at 24.5%. Cape May County had the lowest, at 16.3%. The median was 20.6% and the figure for New Jersey was 21.2%. Source: the U.S. Census Bureau.

Highest24.5Ocean County
Lowest16.3Cape May County
Median20.621 counties
New Jersey21.2History

All counties, 2023

Ocean County: 24.5 %Ocean County24.5Cumberland County: 23.4 %Cumberland County23.4Union County: 23.3 %Union County23.3Passaic County: 22.9 %Passaic County22.9Essex County: 22.8 %Essex County22.8Camden County: 22.2 %Camden County22.2Salem County: 21.9 %Salem County21.9Mercer County: 21.2 %Mercer County21.2Gloucester County: 21 %Gloucester County21Middlesex County: 20.7 %Middlesex County20.7Somerset County: 20.6 %Somerset County20.6Bergen County: 20.5 %Bergen County20.5Burlington County: 20.3 %Burlington County20.3Morris County: 20.2 %Morris County20.2Monmouth County: 20.1 %Monmouth County20.1Atlantic County: 20 %Atlantic County20Warren County: 19.5 %Warren County19.5Sussex County: 19.2 %Sussex County19.2Hudson County: 18.8 %Hudson County18.8Hunterdon County: 18.7 %Hunterdon County18.7Cape May County: 16.3 %Cape May County16.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Ocean County24.50 pts
2Cumberland County23.4-0.2 pts
3Union County23.3-0 pts
4Passaic County22.90 pts
5Essex County22.8-0.2 pts
6Camden County22.2-0.1 pts
7Salem County21.9-0.1 pts
8Mercer County21.2+0.1 pts
9Gloucester County21-0.2 pts
10Middlesex County20.7-0.2 pts
11Somerset County20.6-0.2 pts
12Bergen County20.5-0.1 pts
13Burlington County20.3-0.2 pts
14Morris County20.2-0.1 pts
15Monmouth County20.1-0.1 pts
16Atlantic County20-0.2 pts
17Warren County19.5-0.1 pts
18Sussex County19.2-0 pts
19Hudson County18.8-0.4 pts
20Hunterdon County18.7-0.1 pts
21Cape May County16.3-0.2 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, 2023) [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, 2023. 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=2023. 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, 2023. 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=2023.

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, 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_jersey_2023,
  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, 2023}},
  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=2023. 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, 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-jersey-counties?period=2023.
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 24.5% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Cape May County, with 16.3% in 2023.

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