| Zip Code | City | Population ↓ |
|---|---|---|
| 99163 | Pullman | 33,829 |
| 99111 | Colfax | 4,012 |
| 99161 | Palouse | 1,366 |
| 99171 | Saint John | 969 |
| 99170 | Rosalia | 955 |
| 99130 | Garfield | 833 |
| 99033 | Tekoa | 790 |
| 99143 | Lacrosse | 691 |
| 99125 | Endicott | 626 |
| 99158 | Oakesdale | 619 |
| 99179 | Uniontown | 568 |
| 99113 | Colton | 555 |
| 99102 | Albion | 509 |
| 99128 | Farmington | 289 |
| 99017 | Lamont | 226 |
| 99149 | Malden | 194 |
| 99176 | Thornton | 136 |
| 99333 | Hooper | 91 |
| 99174 | Steptoe | 32 |
| 99136 | Hay | 17 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 20 ZCTAs in Whitman County, Washington (US Census).