There are 26 zip codes in Union County, New Jersey. The most populated is 7083, located in Union. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
708356,900Union
706047,883Plainfield
703644,996Linden
720244,673Elizabeth
720832,632Elizabeth
709030,852Westfield
720630,364Elizabeth
706529,664Rahway
720127,996Elizabeth
707624,727Scotch Plains
790124,281Summit
701623,838Cranford
720322,500Roselle
720522,262Hillside
708117,011Springfield
706615,415Clark
706314,849Plainfield
706214,253Plainfield
720413,964Roselle Park
797412,911New Providence
792212,078Berkeley Heights
70338,345Kenilworth
70237,723Fanwood
70926,991Mountainside
70274,542Garwood
70883,056Vauxhall
showing: 26 rows

Zip Codes in Union County, New Jersey by Population (2024)