ZIP Code 21020 is located in Boring Maryland. 21020 is entirely within Baltimore County. Regionally, it is located in Metro Baltimore.
| ZIP Code Name | Boring |
| Primary County | Baltimore County |
| ZIP Code Type | PO Box |
| Current Time | EDT |
| Coordinates | 39.56364822,-76.83708954 |
| Adjacent ZIP Codes | |
| Region | Metro Baltimore |
| Metropolitan/Micropolitan Stat Area | Baltimore-Columbia-Towson, MD |
| Time Zone | Eastern Daylight Time |
| IANA Timezone | America/New_York |