| Locality | Post Code |
|---|---|
| Alma Lake, Clay | 47834 |
| Art, Clay | 47834 |
| Ashboro, Clay | 47840 |
| Asherville, Clay | 47834 |
| Barrick Corner, Clay | 47841 |
| Bee Ridge, Clay | 47834 |
| Benwood, Clay | 47834 |
| Billtown, Clay | 47834 |
| Billville, Clay | 47834 |
| Bowling Green, Clay | 47833 |
| Brazil, Clay | 47834 |
| Carbon, Clay | 47837 |
| Cardonia, Clay | 47834 |
| Center Point, Clay | 47840 |
| Clay City, Clay | 47841 |
| Cloverland, Clay | 47834 |
| Coalmont, Clay | 47845 |
| Cory, Clay | 47846 |
| Dick Johnson, Clay | 47834 |
| Harmony, Clay | 47853 |
| Hoosierville, Clay | 47834 |
| Knightsville, Clay | 47857 |
| Lena, Clay | 47834 |
| Martz, Clay | 47841 |
| Perth, Clay | 47837 |
| Pontiac, Clay | 47837 |