There are 17 zip codes in Knox County, Illinois. The most populated is 61401, located in Galesburg. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6140130,809Galesburg
614484,076Knoxville
614103,730Abingdon
614021,748Galesburg
614881,284Wataga
614671,244Oneida
614281,162Dahinda
615721,029Yates City
61489841Williamsfield
61414794Altona
61436787Gilson
61430618East Galesburg
61458464Maquon
61472387Rio
61485387Victoria
61474285Saint Augustine
61439250Henderson

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