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U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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Union County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Union County.

County State ZIP Code City Area Codes
Union County NJ 07062 Plainfield 908
Union County NJ 07063 Plainfield 732, 848, 908
Union County NJ 07065 Rahway 732, 848, 908
Union County NJ 07066 Clark 732, 848, 908
Union County NJ 07076 Scotch Plains 732, 848, 908
Union County NJ 07081 Springfield 862, 908, 973
Union County NJ 07083 Union 862, 908, 973
Union County NJ 07088 Vauxhall 862, 908, 973
Union County NJ 07090 Westfield 732, 848, 862, 908, 973
Union County NJ 07091 Westfield 908
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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.