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State of Illinois Illinois, IL Illinois City is an unincorporated community in the U.S. state of Illinois, across the Mississippi River from Muscatine, Iowa. It straddles Buffalo Prairie Township and Drury Township in Rock Island County, Illinois.As of 2014, a United States Post Office, ZIP Code 61259, remains open here at 23828 124th Avenue West. References .
Parcels (number): 0 Parcels (acres): 246704.50000 Buildings (number): 62 Buildings (sq ft): 354375 Leased space (sq ft): 5520088 Population (2015): 12830632