Post Offices List in Clay County, Nebraska:
| Clay Center Post Office | 120 S Alexander Ave, Clay Center, NE 68933 |
| Deweese Post Office | 303 S Deweese Ave, Deweese, NE 68934 |
| Edgar Post Office | 312 N C St, Edgar, NE 68935 |
| Fairfield Post Office | 410 N D St, Fairfield, NE 68938 |
| Glenvil Post Office | 204 Winters Ave, Glenvil, NE 68941 |
| Harvard Post Office | 315 N Clay Ave, Harvard, NE 68944 |
| Sutton Post Office | 108 E Forrest St, Sutton, NE 68979 |
| Trumbull Post Office | 125 Main St, Trumbull, NE 68980 |