Washington zipcode
| City | Washington |
| ZIP Code | 20401 |
| Type | Company/Organization |
| State Code | DC |
| State | District of Columbia |
ZIP code of Washington is 20401. This place is located in District of Columbia state in US. To send any postal service to Washington, you must use 20401 zipcode.
You should avoid following 1 city name of District of Columbia to be used with the ZIP code 20401.
- Gov Printing Office, DC