| Post Office | New Castle |
| Division | New Castle |
| Zipcode | 19720 |
| Post Office | Newark |
| Division | New Castle |
| Zipcode | 19702 |
| Post Office | Newark |
| Division | New Castle |
| Zipcode | 19711 |
| Post Office | Middletown |
| Division | New Castle |
| Zipcode | 19709 |
| Post Office | Bear |
| Division | New Castle |
| Zipcode | 19701 |
| Post Office | Wilmington |
| Division | New Castle |
| Zipcode | 19808 |
| Post Office | Wilmington |
| Division | New Castle |
| Zipcode | 19805 |
| Post Office | Newark |
| Division | New Castle |
| Zipcode | 19713 |
| Post Office | Wilmington |
| Division | New Castle |
| Zipcode | 19802 |
| Post Office | Wilmington |
| Division | New Castle |
| Zipcode | 19810 |
17 City in New Castle | List of Zip Codes Location In Delaware and Your selected County New Castle