| Illinois's 21st congressional district | |
|---|---|
| Obsolete district | |
| Created | 1895 |
| Eliminated | 1990 |
| Years active | 1895-1993 |
The 21st congressional district of Illinois was a congressional district for the United States House of Representatives in Illinois. It was eliminated as a result of the 1990 census. It was last represented by Jerry Costello who was redistricted into the 12th district.