Data / Population density / Union County

Population density in Union County

Population density in Union County was 2,261.2 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.5% from 2024. That is the 3rd highest of 21 counties in 2025.

2025, inhabitants per km²2,261.2
Change on 2024+0.5%
Rank3rd of 21Counties in New Jersey ranked
Series high2,261.22025
Series low2,1512021

Population density in Union County, 2020 to 2025

CSVChart (SVG)

2,1502,1752,2002,2252,2502,2752020202120222023202420252020: 2,154.6 inhabitants per km²2021: 2,151 inhabitants per km²2022: 2,160.1 inhabitants per km²2023: 2,202.1 inhabitants per km²2024: 2,249.5 inhabitants per km²2025: 2,261.2 inhabitants per km²
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09, published 2026-03-26.
All 6 values
Periodinhabitants per km²
20252,261.2
20242,249.5
20232,202.1
20222,160.1
20212,151
20202,154.6

Compared with New Jersey and United States

Place2025
Union County2,261.2
New Jersey501.2
United States37.3

Rankings

Definition

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

How to cite

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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Questions

What is the population density in Union County?

Population density in Union County was 2,261.2 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.5% from 2024. That is the 3rd highest of 21 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved by Invokely on 2026-10-09.

What was the highest population density in Union County?

2,261.2 inhabitants per km² in 2025, the highest value since 2020 in this series.

More statistics for Union County

All statistics for Union County