There are 16 zip codes in Warren County, New Jersey. The most populated is 7840, located in Hackettstown. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
0784032,952Hackettstown
0886530,561Phillipsburg
0788214,670Washington
078259,723Blairstown
078237,644Belvidere
088866,963Stewartsville
078633,582Oxford
078383,190Great Meadows
078323,175Columbia
078652,533Port Murray
07880357Vienna
07833112Delaware
07844104Hope
0783130Changewater
0784622Johnsonburg
078201Allamuchy

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