Illinois elected one Democratic-Republican to the Eighteenth Congress. The Democratic-Republican was part of a faction led by John Quincy Adams and Henry Clay.
Illinois used a statewide at-large system for electing members to Congress.
|At-large||Daniel P. Cook||Adams/Clay||4,765||55.6%||✓|
|At-large||John MacLean||Republican Faction||3,801||44.4%|
In most cases, only candidates who received more than 5 percent of the vote in a district are reported. Other candidates are reported as a group, but only if they in aggregate received more than 5 percent of the vote. In addition, percentages for each district may not add up to 100 percent due to rounding. The term Dissenting Republican includes various breakaway factions of the Democratic-Republican party.
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