There are 8 zip codes in Knox County, Ohio. The most populated is 43050, located in Mount Vernon. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
4305031,064Mount Vernon
430199,905Fredericktown
430287,482Howard
430116,859Centerburg
430143,867Danville
430223,630Gambier
43005445Bladensburg
43037132Martinsburg

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