In which county is ZIP code 21758 located?

ZIP 21758 is listed under Frederick, MD.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 21758: Knoxville, MD

ZIP: 21758

County: Frederick

Coordinates: 39.34790, -77.65130

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Get a reliable snapshot of the Knoxville, MD postal area 21758. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Knoxville
ZIP Code	21758
County	Frederick
State	MD
Latitude / Longitude	39.34790, -77.65130
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 21758 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 21758 is commonly represented around 39.34790, -77.65130. These coordinates help identify the general area within Frederick, MD.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21758 for mail delivery and general location reference in Frederick, MD.

Coverage may include nearby neighborhoods and adjacent unincorporated areas commonly associated with Knoxville.

Related ZIP Codes (Nearby)

Explore other postal codes near Knoxville within MD.

Frequently Asked Questions

What is the primary city for ZIP code 21758?

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

In which county is 21758 located?

ZIP code 21758 is situated within Frederick, MD.

What are the coordinates for 21758?

The approximate center point is 39.34790 (Latitude) and -77.65130 (Longitude).

Is ZIP code 21758 active?

This page lists ZIP 21758 as Listed based on the latest refresh date shown above.

Does ZIP 21758 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