There are 12 zip codes in Ionia County, Michigan. The most populated is 48846, located in Ionia. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4884622,038Ionia
4880911,112Belding
4887510,899Portland
488495,789Lake Odessa
488815,521Saranac
488512,307Lyons
488152,254Clarksville
488651,918Orleans
488601,601Muir
488731,402Pewamo
48845981Hubbardston
48870214Palo

Zip Codes in Ionia County, Michigan by Population (2024)