ZIP Code 21778: Rocky Ridge, MD
County: Frederick
Coordinates: 39.60570, -77.32960
ZIP Type: Standard
Time Zone: Eastern Time (ET)
Explore detailed information for ZIP code 21778 in Rocky Ridge, MD. We include verified county details for Frederick plus key geographic references used for mapping and logistics.
| Primary City | Rocky Ridge |
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| ZIP Code | 21778 |
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| County | Frederick |
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| State | MD |
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| Latitude / Longitude | 39.60570, -77.32960 |
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| ZIP Type | Standard |
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| Time Zone | Eastern Time (ET) |
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| Data Updated | 2026-01-08 |
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Maps & Useful Links
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These links show the approximate center point for ZIP 21778 (not an exact boundary).
Geographic & Administrative Context
The geographic center of ZIP code 21778 is approximately 39.60570 (latitude) and -77.32960 (longitude). This location sits within Frederick, contributing to regional planning across MD.
Local Coverage Notes
ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 21778 for mail delivery and general location reference in
Frederick,
MD.
Coverage may include nearby neighborhoods and adjacent unincorporated areas commonly associated with Rocky Ridge.
Related ZIP Codes (Nearby)
Explore other postal codes near Rocky Ridge within MD.
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Frequently Asked Questions
What is the primary city for ZIP code 21778?
The primary city for this ZIP code is Rocky Ridge, located in MD.
In which county is 21778 located?
ZIP code 21778 is situated within Frederick, MD.
What are the coordinates for 21778?
The approximate center point is 39.60570 (Latitude) and -77.32960 (Longitude).
Is ZIP code 21778 active?
This page lists ZIP 21778 as Listed based on the latest refresh date shown above.
Does ZIP 21778 cover multiple areas?
Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.
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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