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
City
Population
43050Mount Vernon31,064
43019Fredericktown9,905
43028Howard7,482
43011Centerburg6,859
43014Danville3,867
43022Gambier3,630
43005Bladensburg445
43037Martinsburg132

Knox County, Ohio Zip Codes by Population (2024)