There are 8 zip codes in Franklin County, Kansas. The most populated is 66067, located in Ottawa. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6606715,904Ottawa
660924,298Wellsville
660762,346Pomona
660951,105Williamsburg
66080961Richmond
66078812Princeton
66079626Rantoul
66042622Lane

Zip Codes in Franklin County, Kansas by Population (2024)