There are 11 zip codes in Piatt County, Illinois. The most populated is 61856, located in Monticello. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
618568,315Monticello
618131,665Bement
618181,579Cerro Gordo
618541,409Mansfield
619131,229Atwood
618841,081White Heath
61929639Hammond
61839589De Land
61830422Cisco
61936286La Place
61855103Milmine

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