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.

CSV JSON
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)