| Locality | Post Code |
|---|---|
| Bible Grove, Clay | 62858 |
| Blair, Clay | 62858 |
| Clay City, Clay | 62824 |
| Flora, Clay | 62839 |
| Garden Hill, Clay | 62899 |
| Hoosier, Clay | 62858 |
| Hord, Clay | 62858 |
| Ingraham, Clay | 62434 |
| Louisville, Clay | 62858 |
| Oskaloosa, Clay | 62899 |
| Riffel, Clay | 62858 |
| Sailor Springs, Clay | 62824 |
| Songer, Clay | 62899 |
| Xenia, Clay | 62899 |
| Zenith, Clay | 62899 |