21757 vs 21778 ZIP Codes
Keymar, MD · Rocky Ridge, MD
| Metric | 21757 | 21778 |
|---|---|---|
| City | Keymar | Rocky Ridge |
| County | Frederick | Frederick |
| State | Maryland | Maryland |
| Time zone | Eastern Time | Eastern Time |
| Population | 3,036 | 1,094 |
Demographic figures come from U.S. Census Bureau / ACS data included in the source ZIP dataset; many ZIP codes have no demographic figures in that dataset.