| Official Name: | Illinois City, Illinois |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Illinois#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Rock Island |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.18 |
| Area Land Km2: | 1.18 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.46 |
| Area Land Sq Mi: | 0.46 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 159 |
| Population Density Km2: | 134.44 |
| Population Density Sq Mi: | 347.92 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 764 |
| Coordinates: | 41.3975°N -90.8996°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 61259 |
| Area Code: | 309 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 410764 |
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.[2]
, a United States Post Office, ZIP Code 61259,[3] remains open at 23828 124th Avenue West.