ZIP Code 21770
Monrovia · Frederick, Maryland
21770 is the ZIP code of Monrovia in Frederick, Maryland, United States.
- ZIP Code
- 21770
- County
- Frederick
- State
- Maryland
- Country
- United States
Place with ZIP code 21770
| Place | County | Location |
|---|---|---|
| Monrovia | Frederick | 39.351, -77.249 |
Near Washington
The nearest major city is Washington, about 54 km away.
Nearby ZIP codes
Frequently asked questions
Which places use ZIP code 21770?
Monrovia.
Which county and state is 21770 in?
Frederick, Maryland, United States.
What is the nearest major city to 21770?
Washington, about 54 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.