Data / Rankings / Median age / Counties in New Jersey

Counties in New Jersey by median age

Cape May County had the highest median age of 21 counties in 2021, at 50.4 years. Hudson County had the lowest, at 35.6 years. The median was 41.8 years and the figure for New Jersey was 40 years. Source: the U.S. Census Bureau.

Highest50.4Cape May County
Lowest35.6Hudson County
Median41.821 counties
New Jersey40History

All counties, 2021

CSVChart (SVG)

Cape May CountyCape May County: 50.4 years50.4Hunterdon CountyHunterdon County: 46.5 years46.5Sussex CountySussex County: 44.9 years44.9Warren CountyWarren County: 44.1 years44.1Monmouth CountyMonmouth County: 43.3 years43.3Morris CountyMorris County: 42.7 years42.7Salem CountySalem County: 42.5 years42.5Atlantic CountyAtlantic County: 42 years42Ocean CountyOcean County: 42 years42Bergen CountyBergen County: 41.9 years41.9Somerset CountySomerset County: 41.8 years41.8Burlington CountyBurlington County: 41.5 years41.5Gloucester CountyGloucester County: 40.6 years40.6Middlesex CountyMiddlesex County: 39.1 years39.1Union CountyUnion County: 39 years39Mercer CountyMercer County: 38.9 years38.9Camden CountyCamden County: 38.7 years38.7Essex CountyEssex County: 37.8 years37.8Cumberland CountyCumberland County: 37.6 years37.6Passaic CountyPassaic County: 37.5 years37.5Hudson CountyHudson County: 35.6 years35.6
years. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2021
years
1Cape May County50.4
2Hunterdon County46.5
3Sussex County44.9
4Warren County44.1
5Monmouth County43.3
6Morris County42.7
7Salem County42.5
8Atlantic County42
8Ocean County42
10Bergen County41.9
11Somerset County41.8
12Burlington County41.5
13Gloucester County40.6
14Middlesex County39.1
15Union County39
16Mercer County38.9
17Camden County38.7
18Essex County37.8
19Cumberland County37.6
20Passaic County37.5
21Hudson County35.6

Other periods

About this ranking

Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

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. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b01002.dat. Retrieved 2026-10-08.

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Questions

Which county has the highest median age?

Cape May County, with 50.4 years in 2021, according to the U.S. Census Bureau.

Which county has the lowest median age?

Hudson County, with 35.6 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, American Community Survey 5-year estimates, table B01002: median age, total population. Retrieved 2026-10-08.

Median age: other rankings

Counties in New Jersey: more rankings