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
City
Population
61231Aledo5,158
61281Sherrard2,553
61486Viola1,450
61272New Boston1,357
61465New Windsor1,250
61412Alexis1,154
61279Reynolds944
61263Matherville808
61442Keithsburg678
61476Seaton605
61260Joy595
61466North Henderson267
61276Preemption77

Mercer County, Illinois Zip Codes by Population (2024)