In which county is ZIP code 21640 located?

ZIP 21640 is listed under Caroline, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21640: Henderson, MD

ZIP: 21640

County: Caroline

Coordinates: 39.06720, -75.79480

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Get a reliable snapshot of the Henderson, MD postal area 21640. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Henderson
ZIP Code	21640
County	Caroline
State	MD
Latitude / Longitude	39.06720, -75.79480
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 21640 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 21640 is approximately 39.06720 (latitude) and -75.79480 (longitude). This location sits within Caroline, contributing to regional planning across MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21640 for mail delivery and general location reference in Caroline, MD.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Henderson within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21640?

The primary city for this ZIP code is Henderson, located in MD.

In which county is 21640 located?

ZIP code 21640 is situated within Caroline, MD.

What are the coordinates for 21640?

The approximate center point is 39.06720 (Latitude) and -75.79480 (Longitude).

Is ZIP code 21640 active?

This page lists ZIP 21640 as Listed based on the latest refresh date shown above.

Does ZIP 21640 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