ZIP Code 21778 – Rocky Ridge, Maryland
The 21778 ZIP Code belongs to Rocky Ridge, Maryland. The population in this 21778 ZIP code is 840. The latitude is 39.61576 and longitude is -77.33754 in 21778 Rocky Ridge, Maryland. The time zone for this 21778 ZIP code is America/New_York.
| City | Rocky Ridge |
| Zip Code | 21778 |
| State | Maryland |
| County | Frederick |
| Population | 840 |
| Latitude | 39.61576 |
| Longitude | -77.33754 |
| Time Zone | America/New_York |