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 2017, at 23.8%. Cape May County had the lowest, at 17.4%. The median was 21.5% and the figure for New Jersey was 22%. Source: the U.S. Census Bureau.

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Highest23.8Ocean County
Lowest17.4Cape May County
Median21.521 counties
New Jersey22History

Map of counties, 2017

Atlantic County: 21.1 %Bergen County: 21.3 %Burlington County: 21.2 %Camden County: 22.7 %Cape May County: 17.4 %Cumberland County: 23.2 %Essex County: 23.6 %Gloucester County: 22.1 %Hudson County: 20 %Hunterdon County: 20.1 %Mercer County: 21.5 %Middlesex County: 21.6 %Monmouth County: 21.1 %Morris County: 21.5 %Ocean County: 23.8 %Passaic County: 23.4 %Salem County: 21.9 %Somerset County: 22.2 %Sussex County: 20 %Union County: 23.5 %Warren County: 20.4 %
  • Under 20
  • 20 to 21
  • 21 to 22
  • 22 to 23
  • 23 and over
%, 2017. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2017

Ocean County: 23.8 %Ocean County23.8Essex County: 23.6 %Essex County23.6Union County: 23.5 %Union County23.5Passaic County: 23.4 %Passaic County23.4Cumberland County: 23.2 %Cumberland County23.2Camden County: 22.7 %Camden County22.7Somerset County: 22.2 %Somerset County22.2Gloucester County: 22.1 %Gloucester County22.1Salem County: 21.9 %Salem County21.9Middlesex County: 21.6 %Middlesex County21.6Mercer County: 21.5 %Mercer County21.5Morris County: 21.5 %Morris County21.5Bergen County: 21.3 %Bergen County21.3Burlington County: 21.2 %Burlington County21.2Atlantic County: 21.1 %Atlantic County21.1Monmouth County: 21.1 %Monmouth County21.1Warren County: 20.4 %Warren County20.4Hunterdon County: 20.1 %Hunterdon County20.1Hudson County: 20 %Hudson County20Sussex County: 20 %Sussex County20Cape May County: 17.4 %Cape May County17.4Ocean County: 23.8 %Ocean County23.8Essex County: 23.6 %Essex County23.6Union County: 23.5 %Union County23.5Passaic County: 23.4 %Passaic County23.4Cumberland County: 23.2 %Cumberland County23.2Camden County: 22.7 %Camden County22.7Somerset County: 22.2 %Somerset County22.2Gloucester County: 22.1 %Gloucester County22.1Salem County: 21.9 %Salem County21.9Middlesex County: 21.6 %Middlesex County21.6Mercer County: 21.5 %Mercer County21.5Morris County: 21.5 %Morris County21.5Bergen County: 21.3 %Bergen County21.3Burlington County: 21.2 %Burlington County21.2Atlantic County: 21.1 %Atlantic County21.1Monmouth County: 21.1 %Monmouth County21.1Warren County: 20.4 %Warren County20.4Hunterdon County: 20.1 %Hunterdon County20.1Hudson County: 20 %Hudson County20Sussex County: 20 %Sussex County20Cape May County: 17.4 %Cape May County17.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Ocean County23.8+0.1 pts
2Essex County23.6-0.1 pts
3Union County23.5-0.1 pts
4Passaic County23.4-0.1 pts
5Cumberland County23.2-0.1 pts
6Camden County22.7-0.1 pts
7Somerset County22.2-0.3 pts
8Gloucester County22.1-0.3 pts
9Salem County21.9-0.2 pts
10Middlesex County21.6-0.1 pts
11Mercer County21.5-0.1 pts
12Morris County21.5-0.2 pts
13Bergen County21.3-0.1 pts
14Burlington County21.2-0.2 pts
15Atlantic County21.1-0.2 pts
16Monmouth County21.1-0.3 pts
17Warren County20.4-0.3 pts
18Hunterdon County20.1-0.3 pts
19Hudson County20-0.2 pts
20Sussex County20-0.5 pts
21Cape May County17.4-0.1 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, 2017) [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, 2017. 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=2017. 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, 2017. 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=2017.

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, 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_new_jersey_2017,
  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, 2017}},
  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=2017. 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, 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/new-jersey-counties?period=2017.
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 23.8% in 2017, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Cape May County, with 17.4% in 2017.

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