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

Counties in New Jersey by population under 18

Essex County had the highest population under 18 of 21 counties in 2015, at 23.8%. Cape May County had the lowest, at 17.6%. The median was 21.8% and the figure for New Jersey was 22.3%. Source: the U.S. Census Bureau.

Highest23.8Essex County
Lowest17.6Cape May County
Median21.821 counties
New Jersey22.3History

All counties, 2015

Essex County: 23.8 %Essex County23.8Passaic County: 23.7 %Passaic County23.7Union County: 23.7 %Union County23.7Ocean County: 23.6 %Ocean County23.6Cumberland County: 23.3 %Cumberland County23.3Camden County: 23 %Camden County23Somerset County: 22.9 %Somerset County22.9Gloucester County: 22.7 %Gloucester County22.7Salem County: 22.2 %Salem County22.2Morris County: 22 %Morris County22Middlesex County: 21.8 %Middlesex County21.8Monmouth County: 21.8 %Monmouth County21.8Atlantic County: 21.6 %Atlantic County21.6Mercer County: 21.6 %Mercer County21.6Burlington County: 21.6 %Burlington County21.6Bergen County: 21.6 %Bergen County21.6Warren County: 21.1 %Warren County21.1Sussex County: 20.9 %Sussex County20.9Hunterdon County: 20.8 %Hunterdon County20.8Hudson County: 20.3 %Hudson County20.3Cape May County: 17.6 %Cape May County17.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2015 (%)Change on 2014
1Essex County23.8-0.2 pts
2Passaic County23.7-0.2 pts
3Union County23.7-0.1 pts
4Ocean County23.6+0.1 pts
5Cumberland County23.3-0.1 pts
6Camden County23-0.1 pts
7Somerset County22.9-0.4 pts
8Gloucester County22.7-0.3 pts
9Salem County22.2-0.2 pts
10Morris County22-0.3 pts
11Middlesex County21.8-0.1 pts
12Monmouth County21.8-0.3 pts
13Atlantic County21.6-0.3 pts
14Mercer County21.6-0.1 pts
15Burlington County21.6-0.2 pts
16Bergen County21.6-0.2 pts
17Warren County21.1-0.5 pts
18Sussex County20.9-0.5 pts
19Hunterdon County20.8-0.4 pts
20Hudson County20.3-0.1 pts
21Cape May County17.6-0.1 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, 2015) [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, 2015. 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=2015. 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, 2015. 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=2015.

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, 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_jersey_2015,
  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, 2015}},
  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=2015. 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, 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-jersey-counties?period=2015.
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?

Essex County, with 23.8% in 2015, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Cape May County, with 17.6% in 2015.

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