21778 postal code
United StatesUpdated 2026-11-09Rocky Ridge, MarylandFrederick5 digits
Postal code details
1 placeCode
21778
Place
Rocky Ridge
Region
Maryland
County
Frederick
Coordinates
39.6057, -77.3296
Accuracy
4 / 6
Country
United States
Location
OpenStreetMap ↗
39.6057, -77.3296© OpenStreetMap
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Places under this code
1| Place | Region | County | Coordinates |
|---|---|---|---|
| Rocky Ridge | Maryland | Frederick | 39.6057, -77.3296 |
Same code in other countries
0This code only appears in this country.
FAQ
Which city is 21778 in?
Rocky Ridge, Maryland, United States.
What are the coordinates of 21778?
39.6057, -77.3296
Is 21778 used in other countries?
No.
Updated 2026-11-09. Attribution in Data & license.