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
City
Population
48846Ionia22,038
48809Belding11,112
48875Portland10,899
48849Lake Odessa5,789
48881Saranac5,521
48851Lyons2,307
48815Clarksville2,254
48865Orleans1,918
48860Muir1,601
48873Pewamo1,402
48845Hubbardston981
48870Palo214

Ionia County, Michigan Zip Codes by Population (2024)