About ZIP code 21139
The ZIP code 21139 routes mail to Riderwood in the Maryland region of United States. Use it as the postal segment of any address in this area, and confirm unusual addresses with the local postal operator.
United States ยท ZIP code
21139 - Riderwood
ZIP code 21139 is Riderwood in Maryland, United States.
| ZIP code | 21139 |
| Place | Riderwood |
| Region | Maryland |
| District | Baltimore |
| Country | United States (US) |
| Coordinates | 39.4093, -76.6486 (map) |