| Zip Code | City | Population ↓ |
|---|---|---|
| 62321 | Carthage | 3,576 |
| 62341 | Hamilton | 3,433 |
| 62379 | Warsaw | 1,854 |
| 61450 | La Harpe | 1,812 |
| 62330 | Dallas City | 1,472 |
| 62354 | Nauvoo | 1,447 |
| 62367 | Plymouth | 1,294 |
| 62311 | Augusta | 872 |
| 62316 | Bowen | 705 |
| 62358 | Niota | 525 |
| 62313 | Basco | 382 |
| 62380 | West Point | 360 |
| 62373 | Sutter | 225 |
| 62374 | Tennessee | 216 |
| 62334 | Elvaston | 163 |
| 62336 | Ferris | 84 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in Hancock County, Illinois (US Census).