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