| ZIP Code | ZIP Code Place Name | County | ZIP Code Type |
|---|---|---|---|
| 99004 | Cheney | Spokane County | Standard |
| 99017 | Lamont | Whitman County | Standard |
| 99033 | Tekoa | Whitman County | Standard |
| 99102 | Albion | Whitman County | PO Box |
| 99104 | Belmont | Whitman County | Standard |
| 99111 | Colfax | Whitman County | Standard |
| 99113 | Colton | Whitman County | Standard |
| 99125 | Endicott | Whitman County | Standard |
| 99128 | Farmington | Whitman County | Standard |
| 99130 | Garfield | Whitman County | Standard |
| 99136 | Hay | Whitman County | Standard |
| 99143 | Lacrosse | Whitman County | Standard |
| 99149 | Malden | Whitman County | PO Box |
| 99158 | Oakesdale | Whitman County | Standard |
| 99161 | Palouse | Whitman County | Standard |
| 99163 | Pullman | Whitman County | Standard |
| 99164 | Pullman | Whitman County | Unique |
| 99170 | Rosalia | Whitman County | Standard |
| 99171 | Saint John | Whitman County | Standard |
| 99174 | Steptoe | Whitman County | PO Box |
| 99176 | Thornton | Whitman County | Standard |
| 99179 | Uniontown | Whitman County | Standard |
| 99333 | Hooper | Whitman County | PO Box |
| 99347 | Pomeroy | Garfield County | Standard |