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
Population
City
1972060,514New Castle
1970256,571Newark
1971149,746Newark
1970948,954Middletown
1970144,553Bear
1980539,610Wilmington
1980838,107Wilmington
1971329,952Newark
1980226,065Wilmington
1981025,569Wilmington
1980321,437Wilmington
1980417,986Wilmington
1970717,011Hockessin
1980116,545Wilmington
1970316,376Claymont
1980915,529Wilmington
1973414,026Townsend
1980610,273Wilmington
198077,846Wilmington
197176,129Newark
197061,984Delaware City
19730558Odessa
19732364Rockland
19731328Port Penn
19733173Saint Georges
1971026Montchanin
1973617Yorklyn
19735Winterthur
19716Newark
showing: 29 rows

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