| Locality | Post Code |
|---|---|
| Bixby, Clay | 68979 |
| Clay Center, Clay | 68933 |
| Deweese, Clay | 68934 |
| Edgar, Clay | 68935 |
| Fairfield, Clay | 68938 |
| Glenvil, Clay | 68941 |
| Hanover, Clay | 68941 |
| Harvard, Clay | 68944 |
| Inland, Clay | 68954 |
| Leicester, Clay | 68980 |
| Little Blue, Clay | 68941 |
| Lynn, Clay | 68933 |
| Marshall, Clay | 68933 |
| Ong, Clay | 68452 |
| Pauline, Clay | 68941 |
| Saronville, Clay | 68975 |
| School Creek, Clay | 68979 |
| Sedan, Clay | 68935 |
| Spring Ranch, Clay | 68934 |
| Sutton, Clay | 68979 |
| Trumbull, Clay | 68980 |