Union County, NJ Demographics
Union County, NJ is the 7th most populous of 21 counties in New Jersey, with 575,345 residents across 103 square miles. That is about 5,599 people per square mile.
At the 2020 census
| Population | 575,345 |
|---|---|
| Land area | 103 sq mi |
| Density | 5,599 / sq mi |
Data: 2020 Census · American Community Survey 2024
How Union County compares to the US
We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.
Central Location: Union County, NJ
Measured from the county's main population center using 2020 census blocks.
We're computing the drive-time and radius areas around Union County, NJ — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.
Census tracts in Union County, NJ
| Name | Population | Sq mi | Per sq mi |
|---|---|---|---|
| Census Tract 386.01 | 8,476 | 3.0 | 2,803 |
| Census Tract 336 | 8,427 | 2.1 | 3,926 |
| Census Tract 368 | 7,844 | 1.7 | 4,573 |
| Census Tract 364 | 7,403 | 1.9 | 3,864 |
| Census Tract 355 | 7,256 | 0.8 | 9,175 |
| Census Tract 382.02 | 7,146 | 2.5 | 2,835 |
| Census Tract 383 | 7,020 | 4.0 | 1,757 |
| Census Tract 304 | 6,854 | 0.2 | 32,966 |
| Census Tract 312 | 6,712 | 0.3 | 20,058 |
| Census Tract 349 | 6,681 | 0.7 | 10,106 |
| Census Tract 319.03 | 6,516 | 0.2 | 32,629 |
| Census Tract 309 | 6,485 | 0.3 | 22,089 |
| Census Tract 376.02 | 6,481 | 1.8 | 3,634 |
| Census Tract 362 | 6,436 | 1.5 | 4,264 |
| Census Tract 311 | 6,260 | 0.2 | 26,856 |
| Census Tract 382.01 | 6,139 | 3.7 | 1,659 |
| Census Tract 394 | 6,137 | 0.7 | 9,171 |
| Census Tract 385 | 6,136 | 1.2 | 5,014 |
| Census Tract 317 | 6,125 | 0.3 | 20,904 |
| Census Tract 384 | 6,115 | 1.8 | 3,476 |
| Census Tract 379 | 6,111 | 1.9 | 3,219 |
| Census Tract 378 | 6,078 | 1.5 | 4,140 |
| Census Tract 367 | 6,071 | 0.9 | 6,557 |
| Census Tract 353 | 6,062 | 0.4 | 14,154 |
| Census Tract 370 | 6,048 | 1.1 | 5,289 |
| Census Tract 340 | 6,009 | 0.6 | 10,436 |
| Census Tract 325 | 5,994 | 0.9 | 6,809 |
| Census Tract 322 | 5,984 | 0.4 | 14,866 |
| Census Tract 389 | 5,982 | 0.4 | 14,018 |
| Census Tract 375 | 5,979 | 1.2 | 4,906 |
| Census Tract 331 | 5,957 | 0.6 | 9,425 |
| Census Tract 305 | 5,942 | 0.4 | 16,308 |
| Census Tract 392 | 5,838 | 0.5 | 11,556 |
| Census Tract 338 | 5,834 | 0.5 | 11,380 |
| Census Tract 397 | 5,832 | 1.0 | 5,883 |
| Census Tract 314 | 5,807 | 0.2 | 30,167 |
| Census Tract 316.02 | 5,768 | 0.3 | 17,404 |
| Census Tract 315 | 5,690 | 0.3 | 17,672 |
| Census Tract 380 | 5,679 | 1.0 | 5,959 |
| Census Tract 318.01 | 5,616 | 0.2 | 25,504 |
| Census Tract 365 | 5,614 | 1.3 | 4,402 |
| Census Tract 357 | 5,602 | 0.7 | 8,197 |
| Census Tract 360 | 5,444 | 0.8 | 7,088 |
| Census Tract 328 | 5,346 | 0.5 | 11,786 |
| Census Tract 307.03 | 5,284 | 0.2 | 26,549 |
| Census Tract 363.01 | 5,229 | 1.4 | 3,742 |
| Census Tract 381.04 | 5,214 | 1.1 | 4,672 |
| Census Tract 326 | 5,121 | 0.6 | 8,945 |
| Census Tract 329.02 | 5,101 | 0.7 | 7,438 |
| Census Tract 348 | 5,068 | 0.6 | 9,067 |
| Census Tract 381.01 | 5,036 | 1.4 | 3,707 |
| Census Tract 388 | 4,898 | 0.6 | 8,004 |
| Census Tract 344 | 4,852 | 0.5 | 10,481 |
| Census Tract 377 | 4,851 | 1.7 | 2,897 |
| Census Tract 398.01 | 4,838 | 0.4 | 12,106 |
| Census Tract 335.02 | 4,832 | 0.9 | 5,517 |
| Census Tract 327.02 | 4,829 | 0.7 | 6,635 |
| Census Tract 337 | 4,811 | 0.4 | 12,467 |
| Census Tract 345 | 4,775 | 0.4 | 12,552 |
| Census Tract 376.01 | 4,718 | 2.2 | 2,190 |
| Census Tract 373 | 4,641 | 1.1 | 4,309 |
| Census Tract 390 | 4,609 | 0.4 | 11,925 |
| Census Tract 310 | 4,553 | 0.1 | 42,009 |
| Census Tract 335.01 | 4,543 | 0.7 | 6,675 |
| Census Tract 396 | 4,515 | 0.6 | 7,599 |
| Census Tract 374 | 4,511 | 0.7 | 6,308 |
| Census Tract 369 | 4,454 | 0.7 | 6,848 |
| Census Tract 346 | 4,438 | 0.3 | 14,717 |
| Census Tract 343 | 4,422 | 0.6 | 7,514 |
| Census Tract 316.01 | 4,397 | 0.2 | 23,618 |
| Census Tract 371 | 4,373 | 1.1 | 3,869 |
| Census Tract 332 | 4,341 | 1.0 | 4,528 |
| Census Tract 324.01 | 4,340 | 0.3 | 13,794 |
| Census Tract 330 | 4,305 | 1.5 | 2,817 |
| Census Tract 372 | 4,274 | 0.8 | 5,556 |
| Census Tract 386.02 | 4,241 | 3.0 | 1,407 |
| Census Tract 359 | 4,188 | 0.3 | 14,000 |
| Census Tract 313.02 | 4,179 | 0.2 | 25,950 |
| Census Tract 351 | 4,177 | 0.3 | 12,477 |
| Census Tract 347 | 4,139 | 0.3 | 13,263 |
| Census Tract 366 | 4,100 | 0.9 | 4,599 |
| Census Tract 329.01 | 4,100 | 0.6 | 7,131 |
| Census Tract 320.02 | 4,090 | 0.2 | 21,751 |
| Census Tract 387.01 | 4,083 | 0.7 | 5,803 |
| Census Tract 333 | 4,048 | 0.4 | 9,975 |
| Census Tract 395.01 | 3,940 | 0.2 | 17,269 |
| Census Tract 302 | 3,895 | 0.2 | 25,420 |
| Census Tract 363.02 | 3,879 | 1.4 | 2,839 |
| Census Tract 320.03 | 3,875 | 0.2 | 21,438 |
| Census Tract 321.01 | 3,845 | 0.3 | 11,849 |
| Census Tract 334 | 3,818 | 0.5 | 8,010 |
| Census Tract 342 | 3,747 | 0.4 | 9,211 |
| Census Tract 306 | 3,730 | 0.7 | 5,720 |
| Census Tract 356 | 3,727 | 0.6 | 6,507 |
| Census Tract 393.01 | 3,697 | 0.2 | 19,162 |
| Census Tract 387.02 | 3,691 | 0.6 | 5,803 |
| Census Tract 341 | 3,665 | 0.6 | 6,098 |
| Census Tract 324.02 | 3,661 | 0.4 | 10,019 |
| Census Tract 313.01 | 3,408 | 0.3 | 10,284 |
| Census Tract 381.03 | 3,400 | 1.2 | 2,801 |
Showing the 100 most populous of 120 — the rest are shown on the map.
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About this page
This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.
Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.