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.
Zip Code | Population | City |
|---|---|---|
| 19720 | 60,514 | New Castle |
| 19702 | 56,571 | Newark |
| 19711 | 49,746 | Newark |
| 19709 | 48,954 | Middletown |
| 19701 | 44,553 | Bear |
| 19805 | 39,610 | Wilmington |
| 19808 | 38,107 | Wilmington |
| 19713 | 29,952 | Newark |
| 19802 | 26,065 | Wilmington |
| 19810 | 25,569 | Wilmington |
| 19803 | 21,437 | Wilmington |
| 19804 | 17,986 | Wilmington |
| 19707 | 17,011 | Hockessin |
| 19801 | 16,545 | Wilmington |
| 19703 | 16,376 | Claymont |
| 19809 | 15,529 | Wilmington |
| 19734 | 14,026 | Townsend |
| 19806 | 10,273 | Wilmington |
| 19807 | 7,846 | Wilmington |
| 19717 | 6,129 | Newark |
| 19706 | 1,984 | Delaware City |
| 19730 | 558 | Odessa |
| 19732 | 364 | Rockland |
| 19731 | 328 | Port Penn |
| 19733 | 173 | Saint Georges |
| 19710 | 26 | Montchanin |
| 19736 | 17 | Yorklyn |
| 19735 | 0 | Winterthur |
| 19716 | 0 | Newark |