the 1950 census, Illinois was apportioned 25 seats, all of which were elected from single-member districts. 1963–1983: 24 seats Following the 1960 census, Illinois was apportioned 24 seats. 1983–1993: 22 seats Following the 1980 census, Illinois was apportioned 22 seats. 1993–2003: 20 seats Following the 1990 census, Illinois was apportioned 20 seats. 2003–2013: 19 seats Following the 2000 census, Illinois was apportioned 19 seats. 2013–2023: 18 seats Following the 2010 census, Illinois was apportioned 18 seats. From 2023-Present: 17 seats Following the 2020 census, Illinois was apportioned 17 seats. Key See also List of United States congressional districts Illinois's congressional districts Political party strength in Illinois Notes References Illinois Politics of Illinois Congressional delegations