There are 13 zip codes in Mercer County, Illinois. The most populated is 61231, located in Aledo. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
612315,158Aledo
612812,553Sherrard
614861,450Viola
612721,357New Boston
614651,250New Windsor
614121,154Alexis
61279944Reynolds
61263808Matherville
61442678Keithsburg
61476605Seaton
61260595Joy
61466267North Henderson
6127677Preemption

Zip Codes in Mercer County, Illinois by Population (2024)