Counties in New Jersey by median age on 1 July (US county estimates)
Cape May County had the highest median age on 1 July (US county estimates) of 21 counties in 2021, at 51.8 years. Hudson County had the lowest, at 35.3 years. The median was 41.5 years. Source: the U.S. Census Bureau.
Map of counties, 2021
- Under 39
- 39 to 40
- 40 to 42
- 42 to 43
- 43 and over
All counties, 2021
Full ranking
| Rank | Counties | 2021 | Change on 2020 |
|---|---|---|---|
| 1 | Cape May County | 51.8 | +0.3 |
| 2 | Hunterdon County | 46.5 | -0.3 |
| 3 | Sussex County | 44.5 | -0.7 |
| 4 | Warren County | 44.1 | -0.2 |
| 5 | Monmouth County | 43.3 | -0.1 |
| 6 | Atlantic County | 42.5 | 0 |
| 6 | Morris County | 42.5 | -0.1 |
| 8 | Bergen County | 42 | +0.1 |
| 8 | Somerset County | 42 | 0 |
| 10 | Salem County | 41.7 | -0.4 |
| 11 | Burlington County | 41.5 | -0.1 |
| 12 | Ocean County | 41.1 | -0.3 |
| 13 | Gloucester County | 40 | -0.1 |
| 14 | Camden County | 39 | 0 |
| 14 | Mercer County | 39 | +0.5 |
| 16 | Middlesex County | 38.9 | +0.2 |
| 17 | Union County | 38.8 | +0.2 |
| 18 | Cumberland County | 38 | 0 |
| 19 | Passaic County | 37.8 | +0.2 |
| 20 | Essex County | 37.5 | +0.3 |
| 21 | Hudson County | 35.3 | +0.5 |
Other periods
About this ranking
Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.
Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.
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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.Citation styles
APA 7
U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (Counties in New Jersey by median age on 1 July (US county estimates), 2021) [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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in New Jersey by median age on 1 July (US county estimates), 2021. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/new-jersey-counties?period=2021. Accessed 12 Oct. 2026.
Chicago (author-date)
U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Counties in New Jersey by median age on 1 July (US county estimates), 2021. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/new-jersey-counties?period=2021.
Harvard
U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in New Jersey by median age on 1 July (US county estimates), 2021 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/median-age-july-1-us-counties/new-jersey-counties?period=2021 (Accessed: 12 October 2026).
BibTeX
@misc{census_counties_in_new_jersey_2021,
author = {{U.S. Census Bureau}},
title = {{Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in New Jersey by median age on 1 July (US county estimates), 2021}},
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/median-age-july-1-us-counties/new-jersey-counties?period=2021. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in New Jersey by median age on 1 July (US county estimates), 2021
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/median-age-july-1-us-counties/new-jersey-counties?period=2021
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/new-jersey-counties?period=2021.
N1 - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER -
Use this data in your AI agent
Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:
Rank Counties in New Jersey by median age on 1 July (US county estimates) using official data, and cite the source.
rank_places {"indicator":"median_age_pep","level":"province","within":"New Jersey","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=median_age_pep&level=province&within=New%20Jersey&limit=10Questions
Which county has the highest median age on 1 July (US county estimates)?
Cape May County, with 51.8 years in 2021, according to the U.S. Census Bureau.
Which county has the lowest median age on 1 July (US county estimates)?
Hudson County, with 35.3 years in 2021.
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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.