Total Population in Union County, NJ
ACS 2024 5-Year Estimates
579,290
Rank #120/3,222 · #7 in NJ
96th
Union 579,290
NJ 9,343,809 -93.8%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Union County's total population of 579,290 compares to all 3,222 U.S. counties. Values range from 33 to 9,808,667.
Distribution of Total Population Across All Counties
Ranking Context
Counties ranked closest to Union County for total population.
Nearby Rankings
Full ranking →| #117 | Bristol County, MA | 582,270 |
| #118 | Volusia County, FL | 579,622 |
| #119 | Jefferson County, CO | 579,377 |
| #120 | Union County, NJ | 579,290 |
| #121 | Delaware County, PA | 579,222 |
| #122 | New Castle County, DE | 577,961 |
| #123 | Baltimore city, MD | 573,243 |
About Total Population
Union County, New Jersey has a total population of 579,290, ranking #120 of 3,222 counties nationwide — 99.8% below the national value of 330M. Within New Jersey, it ranks #7 of 21. This places it in the 96th percentile nationally.
Total population count from the American Community Survey. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.