House districts / Illinois
Illinois's 15th congressional district
IL-15. Same lines in 2026 as in 2022.
Fundraising
- Mary Miller Ras of Oct 14, 2026Raised $1.9mSpent $1.6m · Cash $911k
- Jennifer Ann Todd Das of Oct 14, 2026Raised $210kSpent $173k · Cash $37k
4 other 2026 candidates filed reports (primary candidates).
Federal Election Commission, candidate totals, public domain.
President in this district
PollCheck calculation from precinct returns on the 2026 lines (method).
| Year | Democrat | Republican | Other | Margin |
|---|---|---|---|---|
| 2024 | Harris 29.1% | Trump 68.7% | 2.2% | R+39.6 |
| 2020 | Biden 29.6% | Trump 68.3% | 2.1% | R+38.7 |
| 2016 | Clinton 27.7% | Trump 66.0% | 6.3% | R+38.3 |
Who lives here
| Measure | This district | US |
|---|---|---|
| People | ||
| Population | 746,652 | |
| Adults (18+) | 585,324 | |
| Citizens, % of adults | 98.9% | 92.1% |
| Age, % of adults | ||
| 18 to 29 | 17.0% | 20.3% |
| 30 to 44 | 23.3% | 25.9% |
| 45 to 64 | 33.0% | 31.8% |
| 65 and over | 26.7% | 22.0% |
| Race and Hispanic origin, % of residents | ||
| White | 89.8% | 57.4% |
| Black | 2.9% | 11.9% |
| Hispanic | 3.1% | 19.3% |
| Asian | 0.9% | 5.9% |
| Other or more than one | 3.5% | 5.5% |
| Education and income | ||
| Bachelor's degree or higher, % of 25+ | 26.1% | 35.7% |
| Median household income | $73,993 | $80,734 |
American Community Survey 2020-2024 5-year estimates for this district. The tick marks the US figure.
Winning margin
Results since 1976
| Year | Winner | Share | Runner-up | Share | Margin |
|---|---|---|---|---|---|
| Current lines (2022 on) seat count changed from 18 to 17 after the census | |||||
| 2024 | Mary E. Miller Republican | 99.5% | William Bonnett Write-in | 0.5% | R+99.1 |
| 2022 | Mary E. Miller Republican | 71.1% | Paul J. Lange Democrat | 28.9% | R+42.3 |
| Earlier lines, elections 2012-2020 seat count changed from 19 to 18 after the census | |||||
| 2020 | Mary Miller Republican | 73.5% | Erika C. Weaver Democrat | 26.6% | R+46.9 |
| 2018 | John Shimkus Republican | 70.9% | Kevin Gaither Democrat | 29.1% | R+41.9 |
| 2016 | John Shimkus Republican | 100.0% | R+100.0 | ||
| 2014 | John Shimkus Republican | 74.9% | Eric Thorsland Democrat | 25.1% | R+49.8 |
| 2012 | John Shimkus Republican | 68.6% | Angela Michael Democrat | 31.4% | R+37.2 |
| Earlier lines, elections 2002-2010 seat count changed from 20 to 19 after the census | |||||
| 2010 | Timothy V. Johnson Republican | 64.3% | David Gill Democrat | 35.7% | R+28.6 |
| 2008 | Timothy V. Johnson Republican | 64.2% | Steve Cox Democrat | 35.8% | R+28.4 |
| 2006 | Timothy V. Johnson Republican | 57.6% | David Gill Democrat | 42.4% | R+15.2 |
| 2004 | Timothy V. Johnson Republican | 61.0% | David Gill Democrat | 39.0% | R+22.1 |
| 2002 | Timothy V. Johnson Republican | 65.2% | Joshua T. Hartke Democrat others 3.8% | 31.0% | R+34.1 |
| Earlier lines, elections 1992-2000 seat count changed from 22 to 20 after the census | |||||
| 2000 | Tim Johnson Republican | 53.2% | F. Michael "Mike" Kelleher, Jr. Democrat | 46.8% | R+6.5 |
| 1998 | Thomas W. Ewing Republican | 61.6% | Laurel Lunt Prussing Democrat | 38.4% | R+23.2 |
| 1996 | Thomas W. Ewing Republican | 57.3% | Laurel Lunt Prussing Democrat | 42.7% | R+14.7 |
| 1994 | Thomas W. Ewing Republican | 68.2% | Paul Alexander Democrat | 31.9% | R+36.3 |
| 1992 | Thomas W. Ewing Republican | 59.3% | Charles D. Mattis Democrat others 0.1% | 40.6% | R+18.8 |
| Earlier lines, elections 1982-1990 seat count changed from 24 to 22 after the census | |||||
| 1990 | Edward R. Madigan Republican | 100.0% | R+100.0 | ||
| 1988 | Edward R. Madigan Republican | 71.7% | Thomas J. (Tom) Curl Democrat | 28.3% | R+43.4 |
| 1986 | Edward Madigan Republican | 100.0% | R+100.0 | ||
| 1984 | Edward R. Madigan Republican | 73.2% | John M. Hoffmann Democrat | 26.8% | R+46.5 |
| 1982 | Edward R. Madigan Republican | 66.3% | Tim L. Hall Democrat | 33.7% | R+32.7 |
| Earlier lines, elections 1976-1980 | |||||
| 1980 | Tom Corcoran Republican | 76.8% | John P. Quillin Democrat | 23.2% | R+53.5 |
| 1978 | Tom Corcoran Republican | 62.4% | Tim L. Hall Democrat | 37.6% | R+24.8 |
| 1976 | Tom Corcoran Republican | 53.9% | Tim L. Hall Democrat | 46.1% | R+7.8 |
More on Illinois
Other Illinois districts
About these results
Shares count all candidate votes, including write-ins, with a candidate's votes on several party lines added together. Each result is on the lines in force at the time. Mid-decade redraws before 2016 may be unmarked.
President in this district: 2016 and 2020 are estimates: precinct votes are split between districts by census block.
Counties only partly inside the district show the 2024 result for that part; estimates are labelled.
Margin chart: winner minus runner-up. Gaps are unopposed races; dashed lines are new district lines.
Sources
Results: MIT Election Data and Science Lab, U.S. House 1976-2016 (doi:10.7910/DVN/IG0UN2, CC0; via MEDSL/constituency-returns), and Clerk of the US House, Statistics of the Presidential and Congressional Election 2018-2024 (public domain).
Presidential results: PollCheck calculation from MIT Election Data and Science Lab 2024 precinct returns (doi:10.7910/DVN/XDJYKC, doi:10.7910/DVN/USBYR4, CC0; state totals doi:10.7910/DVN/42MVDX, CC0) and Voting and Election Science Team 2016 and 2020 precinct results and shapes (doi:10.7910/DVN/NH5S2I, doi:10.7910/DVN/K7760H, CC BY 4.0), with US Census Bureau 2020 block populations and block equivalency files (public domain). Official figures: Texas Legislative Council (2024 on the 2026 lines); Louisiana, New Jersey, California and Washington election offices (county totals). Certified results transcribed by Wikipedia (CC BY-SA 4.0): Maine 2024 by district: 2024 United States presidential election in Maine (revision 1382530995); Indiana county totals: 2024 United States presidential election in Indiana (revision 1382505975); Oregon county totals: 2024 United States presidential election in Oregon (revision 1382605746).
District lines: US Census Bureau TIGER/Line 2026 (120th Congress) and 2025 cartographic boundary files (119th Congress), public domain.
Members: unitedstates/congress-legislators (CC0).
Counties: US Census Bureau 2024 cartographic boundary file (public domain); 2024 county results summed from the same MEDSL precinct returns, with the official county totals above.
Demographics: US Census Bureau, American Community Survey 5-year estimates 2020-2024 (public domain).
2028 candidates: Federal Election Commission (public domain).
Photos: official portraits, public domain (US government); see Photo credits.
PollCheck US. Data through November 5, 2026. Photo credits