First three digits · District of Columbia
ZIP Codes Starting with
28 ZIP codes start with 203, sorted at the Washington, DC (SCF 202) sectional center (USPS labeling list L005, effective October 1, 2026) in District of Columbia: 5 residential ZIP codes across 1 county and 23 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 203 mean?
The first digit, 2, is one of ten national areas (District of Columbia, Maryland, North Carolina, South Carolina, Virginia and West Virginia). The first three, 203, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 203 to the Washington, DC (SCF 202) facility. The last two digits pick the delivery area. By residents, the largest town names among the 203 ZIP codes are Naval Anacost Annex, Washington and Washington Navy Yard.
The same facility sorts 4 prefixes, 202 ZIP codes in all: 202, 203, 204, 205.
Where are the 203 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 203
| County | ||||||
|---|---|---|---|---|---|---|
| 20301 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20303 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20306 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20310 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20314 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20317 | Washington | District of Columbia | 15 | 43 | – | – |
| 20318 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20319 | Washington | District of Columbia | 23 | 168 | – | – |
| 20330 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20340 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20350 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20355 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20370 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20372 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20373 | Naval Anacost Annex | District of Columbia | 383 | 758 | – | – |
| 20374 | Washington Navy Yard | District of Columbia | PO Box or unique | – | – | – |
| 20375 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20376 | Washington Navy Yard | District of Columbia | PO Box or unique | – | – | – |
| 20380 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20388 | Washington Navy Yard | District of Columbia | no residents | 0 | – | – |
| 20389 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20390 | Washington | District of Columbia | 246 | 61,500 | – | – |
| 20391 | Washington Navy Yard | District of Columbia | PO Box or unique | – | – | – |
| 20392 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20393 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20394 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20395 | Washington | District of Columbia | PO Box or unique | – | – | – |
| 20398 | Washington Navy Yard | District of Columbia | PO Box or unique | – | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.