ZIP Code 19721
New Castle · New Castle, Delaware
19721 is the ZIP code of New Castle in New Castle, Delaware, United States.
- ZIP Code
- 19721
- County
- New Castle
- State
- Delaware
- Country
- United States
Place with ZIP code 19721
| Place | County | Location |
|---|---|---|
| New Castle | New Castle | 39.565, -75.597 |
Near Philadelphia
The nearest major city is Philadelphia, about 57 km away.
Nearby ZIP codes
Frequently asked questions
Which places use ZIP code 19721?
New Castle.
Which county and state is 19721 in?
New Castle, Delaware, United States.
What is the nearest major city to 19721?
Philadelphia, about 57 km away.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.