13 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 61231 | Aledo | 4,958 |
| 61281 | Sherrard | 2,610 |
| 61272 | New Boston | 1,463 |
| 61486 | Viola | 1,429 |
| 61412 | Alexis | 1,310 |
| 61465 | New Windsor | 1,251 |
| 61279 | Reynolds | 960 |
| 61263 | Matherville | 718 |
| 61260 | Joy | 635 |
| 61476 | Seaton | 553 |
| 61442 | Keithsburg | 550 |
| 61466 | North Henderson | 274 |
| 61276 | Preemption | 28 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 13 ZCTAs in Mercer County, Illinois (US Census).