| Locality | Post Code |
|---|---|
| Barnes, Washington | 66933 |
| Clifton, Washington | 66937 |
| Greenleaf, Washington | 66943 |
| Haddam, Washington | 66944 |
| Hanover, Washington | 66945 |
| Hollenberg, Washington | 66946 |
| Linn, Washington | 66953 |
| Mahaska, Washington | 66955 |
| Morrowville, Washington | 66958 |
| Palmer, Washington | 66962 |
| Washington, Washington | 66968 |