There are 36 zip codes in Middlesex County, New Jersey. The most populated is 8854, located in Piscataway. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
885460,233Piscataway
886158,136Perth Amboy
890156,870New Brunswick
883154,229Monroe Township
881649,027East Brunswick
881748,140Edison
890243,037North Brunswick
885740,430Old Bridge
882039,565Edison
700825,170Carteret
885924,487Parlin
708024,256South Plainfield
887922,514South Amboy
709520,927Woodbridge
853620,693Plainsboro
887219,613Sayreville
883719,544Edison
706718,581Colonia
883018,511Iselin
884018,075Metuchen
885218,068Monmouth Junction
700117,211Avenel
888216,081South River
890414,996Highland Park
884614,525Middlesex
881214,054Dunellen
882413,297Kendall Park
886312,663Fords
851212,519Cranbury
88508,410Milltown
88108,361Dayton
88848,152Spotswood
70644,031Port Reading
88322,745Keasbey
70772,695Sewaren
88282,302Helmetta
showing: 36 rows

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