ZIP Code 21203 is located in Baltimore Maryland. 21203 is entirely within Baltimore City County. Regionally, it is located in Metro Baltimore.
| ZIP Code Name | Baltimore |
| Primary County | Baltimore City County |
| ZIP Code Type | PO Box |
| Current Time | EDT |
| Coordinates | 39.29123688,-76.60457611 |
| Adjacent ZIP Codes | |
| Region | Metro Baltimore |
| Metropolitan/Micropolitan Stat Area | Baltimore-Columbia-Towson, MD |
| Time Zone | Eastern Daylight Time |
| IANA Timezone | America/New_York |
| Area | 0.00044998 Square Miles |