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U.S. ZIP Codes Database 2026

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Middlesex County ZIP Codes

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

County State ZIP Code City Area Codes
Middlesex County NJ 07077 Sewaren 347, 718, 732, 848, 917, 929
Middlesex County NJ 07080 South Plainfield 732, 848, 908
Middlesex County NJ 07095 Woodbridge 732, 848
Middlesex County NJ 08536 Plainsboro 609, 640, 732, 848
Middlesex County NJ 08810 Dayton 609, 640, 732, 848
Middlesex County NJ 08812 Dunellen 732, 848, 908
Middlesex County NJ 08816 East Brunswick 732, 848
Middlesex County NJ 08817 Edison 732, 848, 908
Middlesex County NJ 08818 Edison 732
Middlesex County NJ 08820 Edison 732, 848, 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.