How many people live in Union County, NJ?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 594,200 people living in Union County, NJ. That makes Union County the seventh-most populous county in New Jersey. It is home to 6.2% of people living in the state.
594K
population of Union County, NJ (2024)
6.2%
County share of the New Jersey population (2024)
About 594,200 people lived in Union County, NJ in 2024.
Population estimates, 2000–2024
What are Union County, NJ’s age demographics?
About 92,600 Union County residents are aged 65 and older in 2024. That represents 15.6% of its population. For comparison, the age group represents 18% of New Jersey’s population and 18% in the US overall.
Another 139,100 Union County residents, or 23.4% of the population, were children under 18. For comparison, the age group represents 21.5% of New Jersey’s population and 21.6% in the US overall.
A lower share of Union County, NJ's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Union County, NJ’s racial and ethnic demographics?
Hispanic residents make up 36.7% of the Union County, NJ population, higher than the national share of 20%. Union County, NJ also has a larger share of people identifying as non-Hispanic Black or African American (20.2%) than the US overall (12.6%).
In contrast, Union County’s non-Hispanic white population accounts for 35.3%, below the 57.5% nationwide, and the non-Hispanic two or more races population makes up 1.4% of the county, compared with 2.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Union County, NJ has a higher share of a Hispanic population than New Jersey as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Union County, NJ is Elizabeth with about 140,400 residents in 2024.
Cities and towns in Union County, NJ ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Elizabeth | 140,413 |
| 2. | Union | 63,171 |
| 3. | Plainfield | 56,507 |
| 4. | Linden | 45,393 |
| 5. | Westfield | 32,050 |
| 6. | Rahway | 30,763 |
| 7. | Scotch Plains | 25,223 |
| 8. | Cranford | 24,513 |
| 9. | Summit | 23,102 |
| 10. | Roselle borough | 23,064 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
