19721 zip code is for the new castle city which is located in new castle county of the delaware state. The complete information of the zip code 19721 is given below :
| Zip code | 19721 |
| City | New Castle |
| County | New Castle |
| State | Delaware |
| Country | United States |
| Time zone | Eastern standard time (GMT -05:00) |
| Latitude | 39.6845° N |
| Longitude | 75.6099° W |