| ZIP Code | 20001 |
| ZIP Code Name | Washington |
| State | District of Columbia |
| County | District of Columbia |
| Timezone | Eastern Daylight Time (EDT) |
| Adjacent ZIP Codes | 20002 20004 20005 20009 20010 20059 20060 20208 20210 20213 20215 20216 20217 20221 20223 20226 20268 20314 20401 20425 20442 20444 20529 20534 20535 20536 20548 20560 20565 20580 |