Andoza:United States representatives from Illinois's obsolete districts
| At-large | subgroup |   |
|---|---|---|
| 18th district {1873–2023) | ||
| 19th district (1873–2013) | ||
| 20th district (1883–2003) | ||
| 21st district (1895–1993) | ||
| 22nd district (1895–1993) | ||
| 23rd district (1903–1983) | ||
| 24th district (1903–1983) | ||
| 25th district (1903–1963) | ||
| 26th district (1949–1953) | ||