Founded in 1856, Polk County is one of 93 counties in the state of Nebraska. Historically, Polk County was formed from York County and unorganized territory. The city of Osceola is the county seat. With FIPS code of 143, Polk County has a population of 5,174 and area of 439 square miles (1,137 km2).
List of all cities in Polk County, NE alphabetically
| City/Town | Postal Code | Area Code |
| Osceola, NE | 68651 | 402 |
| Polk, NE | 68654 | 402 |
| Shelby, NE | 68662 | 402 |
| Stromsburg, NE | 68666 | 402 |