# Counties in New Jersey by population under 18, 2025

All 21 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population_0_17_share`
- Unit: %
- Definition: 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.
- Source: 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: 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.
- Web page: https://invokely.ai/rankings/population-under-18/new-jersey-counties

| Rank | Place | % |
|---:|---|---:|
| 1 | Ocean County | 24.6 |
| 2 | Cumberland County | 23.1 |
| 3 | Union County | 23 |
| 4 | Passaic County | 22.8 |
| 5 | Essex County | 22.3 |
| 6 | Camden County | 21.7 |
| 7 | Salem County | 21.6 |
| 8 | Mercer County | 21.1 |
| 9 | Gloucester County | 20.4 |
| 10 | Middlesex County | 20.2 |
| 11 | Bergen County | 20 |
| 12 | Somerset County | 20 |
| 13 | Morris County | 19.9 |
| 14 | Burlington County | 19.9 |
| 15 | Monmouth County | 19.8 |
| 16 | Atlantic County | 19.5 |
| 17 | Sussex County | 19.1 |
| 18 | Warren County | 19 |
| 19 | Hunterdon County | 18.3 |
| 20 | Hudson County | 18.2 |
| 21 | Cape May County | 15.7 |