Post Offices List in Polk County, Nebraska:
| Osceola Post Office | 241 N Main St, Osceola, NE 68651 |
| Polk Post Office | 210 N Main St, Polk, NE 68654 |
| Shelby Post Office | 210 N Walnut St, Shelby, NE 68662 |
| Stromsburg Post Office | 109 E 4th St, Stromsburg, NE 68666 |