There are 17 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
784032,952Hackettstown
886530,561Phillipsburg
788214,670Washington
78259,723Blairstown
78237,644Belvidere
88866,963Stewartsville
88024,380Asbury
78633,582Oxford
78383,190Great Meadows
78323,175Columbia
78652,533Port Murray
7880357Vienna
7833112Delaware
7844104Hope
783130Changewater
784622Johnsonburg
78201Allamuchy
showing: 17 rows

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