ZIP Codes in Federal Way, WA
Federal Way uses 2 ZIP codes, all in King County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 2 Federal Way ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 98003 | standard | King | 51,619 |
| 98023 | standard | King | 50,448 |
Finding a ZIP+4 in Federal Way
Knowing which of these 2 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Federal Way street almost always have different ZIP+4 codes even though they share all five leading digits.
Appending ZIP+4 to a mailing list?
Upload a CSV of Federal Way addresses and download it complete.