ZIP codes in Mercer County
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- 61231 AledoMercer County
- 61260 JoyMercer County
- 61263 MathervilleMercer County
- 61272 JoyMercer County
- 61276 PreemptionMercer County
- 61281 SherrardMercer County
- 61442 KeithsburgMercer County
- 61465 New WindsorMercer County
- 61466 AlexisMercer County
- 61476 Little YorkMercer County
- 61486 ViolaMercer County