U.S. postal lookup

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 07092 Mountainside 862, 908, 973
Union County NJ 07201 Elizabeth 862, 908, 973
Union County NJ 07202 Elizabeth 347, 718, 908, 917, 929
Union County NJ 07203 Roselle 908
Union County NJ 07204 Roselle Park 908
Union County NJ 07205 Hillside 862, 908, 973
Union County NJ 07206 Elizabethport 347, 718, 908, 917, 929
Union County NJ 07207 Elizabeth 908
Union County NJ 07208 Elizabeth 862, 908, 973
Union County NJ 07901 Summit 862, 908, 973
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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.