Postal codes for Mercer County-Illinois
Mercer County-IllinoisMercer County-IllinoisMercer County-IllinoisMercer County-Illinois
| 61231 Aledo | 309 | Mercer County | Illinois (IL) |
| 61231 Hamlet | 309 | Mercer County | Illinois (IL) |
| 61231 Mercer | 309 | Mercer County | Illinois (IL) |
| 61231 Ohio Grove | 309 | Mercer County | Illinois (IL) |
| 61231 Old Gilchrist | 309 | Mercer County | Illinois (IL) |
| 61231 Shale City | 309 | Mercer County | Illinois (IL) |
| 61231 Wanlock | 309 | Mercer County | Illinois (IL) |
| 61231 Sunbeam | 309 | Mercer County | Illinois (IL) |
| 61260 Joy | 309 | Mercer County | Illinois (IL) |
| 61263 Matherville | 309 | Mercer County | Illinois (IL) |
| 61272 Eliza | 309 | Mercer County | Illinois (IL) |
| 61272 New Boston | 309 | Mercer County | Illinois (IL) |
| 61276 Preemption | 309 | Mercer County | Illinois (IL) |
| 61281 Boden | 309 | Mercer County | Illinois (IL) |
| 61281 Cable | 309 | Mercer County | Illinois (IL) |
| 61281 Sherrard | 309 | Mercer County | Illinois (IL) |
| 61281 Richland Grove | 309 | Mercer County | Illinois (IL) |
| 61412 Alexis | 309 | Mercer County | Illinois (IL) |
| 61412 Shanghai City | 309 | Mercer County | Illinois (IL) |
| 61442 Keithsburg | 309 | Mercer County | Illinois (IL) |
| 61465 New Windsor | 309 | Mercer County | Illinois (IL) |
| 61466 North Henderson | 309 | Mercer County | Illinois (IL) |
| 61476 Seaton | 309 | Mercer County | Illinois (IL) |
| 61486 Viola | 309 | Mercer County | Illinois (IL) |
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