HOUSE
Illinois IL-06 House2026
RACE AT A GLANCE
RACE TYPE
Incumbent running
Sean Casten (D)
COOK PARTISAN VOTING INDEX
Last updated : Nov 17, 2025D +50
R +50
D +3
Race summary
Rep. Sean Casten won his 2024 race by eight points, a closer margin than most operatives expected.Key Dates
Filing Deadline: Nov 3, 2025
Primary Election: Mar 17, 2026
INCUMBENT
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INCUMBENT
Full Bio:
CASTEN, Sean, a Representative from Illinois; born in Dublin, Ireland, November 23, 1971; graduated from Woodlands High School, Hartsdale, NY, 1989; B.A., Middlebury College, Middlebury, Vt., 1993; M.S., Dartmouth College, Hanover, N.H., 1998; M.E.M., Dartmouth College, Hanover, N.H., 1998; businessman; scientist; consultant; elected as a Democrat to the One Hundred Sixteenth Congress (January 3, 2019-present).
Source: Bioguide
CANDIDATES
Republicans
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DISTRICT DATA
Illinois - 06
Southwest Chicago suburbs: Oak Lawn, Downers Grove
Population Breakdown
Source: 2020 Census (VAP) for 2026
Past Presidential Results from this District
2024 Election Results
Source: Dave Leip
2020 Election Results
Source: Dave's Redistricting/VEST
RACE ANALYSIS
Race Analysis
Updated: Apr 23, 2025
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