New Castle zipcode
| City | New Castle |
| ZIP Code | 19721 |
| Type | Company/Organization |
| State Code | DE |
| State | Delaware |
ZIP code of New Castle is 19721. This place is located in Delaware state in US. To send any postal service to New Castle, you must use 19721 zipcode.
You should avoid following 1 city name of Delaware to be used with the ZIP code 19721.
- Citibank, DE