ZIP Code 22121 is located in Mount Vernon Virginia. 22121 is entirely within Fairfax County. Regionally, it is located in Metro DC.
| ZIP Code Name | Mount Vernon |
| Primary County | Fairfax County |
| ZIP Code Type | PO Box |
| Current Time | EDT |
| Coordinates | 38.71219254,-77.08615112 |
| Adjacent ZIP Codes | |
| Region | Metro DC |
| Metropolitan/Micropolitan Stat Area | Washington-Arlington-Alexandria, DC-VA-MD-WV |
| Time Zone | Eastern Daylight Time |
| IANA Timezone | America/New_York |