There are 10 zip codes in Washington County, Illinois. The most populated is 62263, located in Nashville. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
622635,109Nashville
622711,994Okawville
628081,902Ashley
628031,128Hoyleton
622141,050Addieville
622681,001Oakdale
62848514Irvington
62877441Richview
62831380Du Bois
62876135Radom

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