There are 10 zip codes in Mercer County, Ohio. The most populated is 45822, located in Celina. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4582219,779Celina
458286,555Coldwater
458464,694Fort Recovery
458833,849Saint Henry
458822,865Rockford
458602,618Maria Stein
458621,314Mendon
45826302Chickasaw
45310292Burkettsville
45866104Montezuma

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