ZIP Codes in Kennewick, WA
Kennewick uses 3 ZIP codes, all in Benton County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 3 Kennewick ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 99336 | standard | Benton | 50,735 |
| 99337 | standard | Benton | 33,287 |
| 99338 | standard | Benton | 20,633 |
Finding a ZIP+4 in Kennewick
Knowing which of these 3 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 Kennewick street almost always have different ZIP+4 codes even though they share all five leading digits.
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