ZIP Code 21778
Rocky Ridge · Frederick, Maryland
21778 is the ZIP code of Rocky Ridge in Frederick, Maryland, United States.
- ZIP Code
- 21778
- County
- Frederick
- State
- Maryland
- Country
- United States
Place with ZIP code 21778
| Place | County | Location |
|---|---|---|
| Rocky Ridge | Frederick | 39.606, -77.330 |
Near Baltimore
The nearest major city is Baltimore, about 71 km away.
Nearby ZIP codes
Frequently asked questions
Which places use ZIP code 21778?
Rocky Ridge.
Which county and state is 21778 in?
Frederick, Maryland, United States.
What is the nearest major city to 21778?
Baltimore, about 71 km away.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.