Union County, New Jersey
County seat: Elizabeth · Population 601,863 (2025) · 103 sq mi
Union County is the 7th most populous of New Jersey's 21 counties, with 601,863 people (2025 estimate). Its county seat is Elizabeth. The map shows its 13 cities and towns and the 6 neighboring counties.
Union County facts
- County seat
- Elizabeth
- Population (2025 estimate)
- 601,863 +4.6% since 2020
- Land area
- 103 sq mi 20th largest of 21
- Water area
- 3 sq mi
- Population density
- 5,857 per sq mi
- Established
- 1857
- Same name
- One of 17 Union Counties in the US
- Named after
- Union northern side in the American Civil War (1861-1865)
- Largest city
- Elizabeth 141,675
- Median household income
- $103,202
- Cities and towns
- 13 plus 6 CDPs
- ZIP codes
- 27
- Time zone
- Eastern
- FIPS code
- 34039
Cities and towns in Union County
Union County has 13 incorporated cities, towns and villages. Populations count the people living inside Union County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Elizabeth (county seat) | City | 141,675 | |
| Plainfield | City | 57,141 | |
| Linden | City | 45,752 | |
| Westfield | Town | 32,595 | |
| Rahway | City | 31,010 | |
| Summit | City | 23,314 | |
| Roselle | Borough | 23,261 | |
| Roselle Park | Borough | 15,603 | |
| New Providence | Borough | 14,092 | |
| Kenilworth | Borough | 8,602 | |
| Fanwood | Borough | 8,035 | |
| Mountainside | Borough | 7,346 | |
| Garwood | Borough | 5,390 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Vauxhall | 5,959 | Essex County |
| Union | 2,774 | |
| Cranford | 1,937 | |
| Kean University | 1,362 | |
| Springfield | 1,304 | |
| Connecticut Farms | 516 |
ZIP codes in Union County
27 ZIP codes reach into Union County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 07016
- 07023
- 07027
- 07033
- 07036
- 07060 also Somerset and Middlesex counties
- 07062 also Somerset County
- 07063 also Somerset and Middlesex counties
- 07065
- 07066
- 07076
- 07081
- 07083
- 07088
- 07090
- 07092
- 07201
- 07202
- 07203
- 07204
- 07205
- 07206
- 07208
- 07901
- 07922
- 07974
- 08812 also Somerset and Middlesex counties
Population of Union County, 2020–2025
Union County grew by 26,531 people (+4.6%) between April 2020 and July 2025: 11,995 more births than deaths and a net gain of 14,023 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 573,482 |
| 2021 | 572,522 |
| 2022 | 574,934 |
| 2023 | 586,115 |
| 2024 | 598,743 |
| 2025 | 601,863 |
Neighboring counties
- Middlesex County south · 883,335 people
- Essex County north · 896,379 people
- Somerset County west · 356,486 people
- Morris County northwest · 524,251 people
- Richmond County, New York southeast · 501,290 people
- Hudson County east · 735,033 people
Printable Union County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (113 KB)
- PNG (2400 px) (100 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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