20 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 99163 | Pullman | 34,022 |
| 99111 | Colfax | 4,038 |
| 99161 | Palouse | 1,435 |
| 99170 | Rosalia | 926 |
| 99171 | Saint John | 895 |
| 99033 | Tekoa | 832 |
| 99130 | Garfield | 693 |
| 99179 | Uniontown | 645 |
| 99125 | Endicott | 611 |
| 99143 | Lacrosse | 585 |
| 99158 | Oakesdale | 561 |
| 99113 | Colton | 560 |
| 99102 | Albion | 495 |
| 99128 | Farmington | 259 |
| 99017 | Lamont | 230 |
| 99176 | Thornton | 163 |
| 99333 | Hooper | 151 |
| 99149 | Malden | 100 |
| 99174 | Steptoe | 69 |
| 99136 | Hay | 14 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 20 ZCTAs in Whitman County, Washington (US Census).