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These are tables of congressional delegations from Illinois to the United States Senate and United States House of Representatives.
[edit] United States Senate
- See also: List of United States Senators from Illinois
The Illinois Territory was established on March 1, 1809.
Part of the area of Illinois Territory became the State of Illinois on December 3, 1818.
[edit] United States House of Representatives
- See also: List of United States Representatives from Illinois
[edit] 1818 - 1833: One seat
From statehood in 1818, until the addition of two seats in 1833, Illinois had one Representative, elected at-large state-wide.
[edit] 1833 - 1843: 3 seats
[edit] 1843 - present
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