26 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 07083 | Union | 58,170 |
| 07060 | Plainfield | 48,363 |
| 07036 | Linden | 45,671 |
| 07202 | Elizabeth | 44,968 |
| 07208 | Elizabeth | 31,937 |
| 07206 | Elizabethport | 31,930 |
| 07090 | Westfield | 31,111 |
| 07065 | Rahway | 30,109 |
| 07201 | Elizabeth | 28,467 |
| 07076 | Scotch Plains | 24,843 |
| 07901 | Summit | 24,314 |
| 07016 | Cranford | 24,074 |
| 07203 | Roselle | 22,646 |
| 07205 | Hillside | 22,349 |
| 07081 | Springfield | 17,171 |
| 07066 | Clark | 15,622 |
| 07062 | Plainfield | 15,399 |
| 07063 | Plainfield | 14,235 |
| 07204 | Roselle Park | 14,093 |
| 07974 | New Providence | 13,349 |
| 07922 | Berkeley Heights | 12,195 |
| 07033 | Kenilworth | 8,401 |
| 07023 | Fanwood | 7,799 |
| 07092 | Mountainside | 7,049 |
| 07027 | Garwood | 4,885 |
| 07088 | Vauxhall | 2,901 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 26 ZCTAs in Union County, New Jersey (US Census).