In which county is ZIP code 19721 located?

ZIP 19721 is listed under New Castle, DE.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 19721: New Castle, DE

ZIP: 19721

County: New Castle

Coordinates: 39.56450, -75.59700

ZIP Type: Standard

Time Zone: Eastern Time (ET)

This profile provides an in-depth look at ZIP code 19721, serving New Castle in DE. It lies in New Castle and supports delivery, planning, and address verification.

Primary City	New Castle
ZIP Code	19721
County	New Castle
State	DE
Latitude / Longitude	39.56450, -75.59700
ZIP Type	Standard
Time Zone	Eastern Time (ET)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 19721 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 19721 is approximately 39.56450 (latitude) and -75.59700 (longitude). This location sits within New Castle, contributing to regional planning across DE.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 19721 for mail delivery and general location reference in New Castle, DE.

Some addresses near New Castle may share this ZIP due to delivery routing and local service areas.

Related ZIP Codes (Nearby)

Explore other postal codes near New Castle within DE.

Frequently Asked Questions

What is the primary city for ZIP code 19721?

The primary city for this ZIP code is New Castle, located in DE.

In which county is 19721 located?

ZIP code 19721 is situated within New Castle, DE.

What are the coordinates for 19721?

The approximate center point is 39.56450 (Latitude) and -75.59700 (Longitude).

Is ZIP code 19721 active?

This page lists ZIP 19721 as Listed based on the latest refresh date shown above.

Does ZIP 19721 cover multiple areas?

Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.

Methodology & Data Notes

How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.

Page updated: 2026-01-08