New Castle zipcode
| City | New Castle |
| ZIP Code | 19720 |
| Type | Standard |
| State Code | DE |
| State | Delaware |
ZIP code of New Castle is 19720. This place is located in Delaware state in US. To send any postal service to New Castle, you must use 19720 zipcode.
The ZIP code 19720 is also used with 3 more city names of Delaware.
- Historic New Castle, DE
- Hst Newcastle, DE
- Manor, DE
You should avoid following 1 city name of Delaware to be used with the ZIP code 19720.
- Minquadale, DE