Post Offices List in Greer County, Oklahoma:
| Granite Post Office | 402 N Granite St, Granite, OK 73547 |
| Mangum Post Office | 101 S Pennsylvania Ave, Mangum, OK 73554 |
| Willow Post Office | 113 W Main St, Willow, OK 73673 |
| Granite Post Office | 402 N Granite St, Granite, OK 73547 |
| Mangum Post Office | 101 S Pennsylvania Ave, Mangum, OK 73554 |
| Willow Post Office | 113 W Main St, Willow, OK 73673 |