There are 29 zip codes in New Castle County, Delaware. The most populated is 19720, located in New Castle. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
19720New Castle60,514
19702Newark56,571
19711Newark49,746
19709Middletown48,954
19701Bear44,553
19805Wilmington39,610
19808Wilmington38,107
19713Newark29,952
19802Wilmington26,065
19810Wilmington25,569
19803Wilmington21,437
19804Wilmington17,986
19707Hockessin17,011
19801Wilmington16,545
19703Claymont16,376
19809Wilmington15,529
19734Townsend14,026
19806Wilmington10,273
19807Wilmington7,846
19717Newark6,129
19706Delaware City1,984
19730Odessa558
19732Rockland364
19731Port Penn328
19733Saint Georges173
19710Montchanin26
19736Yorklyn17
19735Winterthur0
19716Newark0
showing: 29 rows

New Castle County, Delaware Zip Codes by Population (2024)