There are 8 zip codes in Marion County, Ohio. The most populated is 43302, located in Marion. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4330255,090Marion
433423,699Prospect
433142,555Caledonia
433321,585La Rue
433561,111Waldo
43341835New Bloomington
43337769Morral
43322447Green Camp

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