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
showing: 17 rows

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