13 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 61231 | Aledo | 4,962 |
| 61281 | Sherrard | 2,520 |
| 61272 | New Boston | 1,437 |
| 61412 | Alexis | 1,392 |
| 61486 | Viola | 1,330 |
| 61465 | New Windsor | 1,192 |
| 61279 | Reynolds | 1,015 |
| 61260 | Joy | 737 |
| 61263 | Matherville | 657 |
| 61476 | Seaton | 551 |
| 61442 | Keithsburg | 504 |
| 61466 | North Henderson | 263 |
| 61276 | Preemption | 88 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 13 ZCTAs in Mercer County, Illinois (US Census).