| Official Name: | Shanghai 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: | Warren |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 725 |
| Coordinates: | 41.0508°N -90.4967°W |
| Area Code: | 309 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 421689 |
Shanghai City is an unincorporated community in Warren County, Illinois, United States. Shanghai City is 3miles east-southeast of Alexis.
The community was originally named Ionia. Its present name comes from the Shanghai rooster, an aggressive rooster once commonly used in cockfighting. At its peak in the 1850s, Shanghai City had roughly 250 residents and several businesses, including a wagon factory. Its population steadily declined in the twentieth century, and after a 1968 tornado it was reduced to six homes and a school building.[1]