Illinois 15th Congressional District
Akashic| Year | Margin (D minus R) |
|---|---|
| 2008 | −9.5% |
| 2012 | −24.4% |
| 2016 | −38.4% |
| 2020 | −38.7% |
| 2024 | −39.6% |
Federal officeholders only. State and local officeholders are planned for the next data pass.
U.S. House
Each result reflects the U.S. House district as it was drawn for that election; redistricting has redrawn these lines over time, so they can differ from the current 120th-Congress district shown on the map above.
| Year | District | Won | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | 15 | R | 0.0%0 | 99.5%308,825 | 310,234 |
| 2022 | 15 | R | 28.9%86,396 | 71.1%213,007 | 299,403 |
| 2020 | 15 | R | 26.6%88,559 | 73.4%244,947 | 333,506 |
| 2018 | 15 | R | 29.1%74,309 | 70.9%181,294 | 255,608 |
| 2016 | 15 | R | 0.0%0 | 100.0%274,554 | 274,554 |
| 2014 | 15 | R | 25.1%55,652 | 74.9%166,274 | 221,926 |
| 2012 | 15 | R | 31.4%94,162 | 68.6%205,775 | 299,937 |
| 2010 | 15 | R | 35.7%75,948 | 64.3%136,915 | 212,863 |
| 2008 | 15 | R | 35.8%104,393 | 64.2%187,121 | 291,514 |
| 2006 | 15 | R | 42.4%86,025 | 57.6%116,810 | 202,835 |
| 2004 | 15 | R | 38.9%113,625 | 61.1%178,114 | 291,739 |
| 2002 | 15 | R | 31.0%64,131 | 65.2%134,650 | 206,617 |
| 2000 | 15 | R | 46.8%110,679 | 53.2%125,943 | 236,622 |
| 1998 | 15 | R | 38.4%65,054 | 61.6%104,255 | 169,309 |
| 1996 | 15 | R | 42.7%90,065 | 57.3%121,019 | 211,084 |
| 1994 | 15 | R | 31.8%50,874 | 68.2%108,857 | 159,731 |
| 1992 | 15 | R | 40.6%97,190 | 59.3%142,167 | 239,586 |
| 1990 | 15 | R | 0.0%0 | 100.0%119,812 | 119,822 |
| 1988 | 15 | R | 28.3%55,260 | 71.7%140,171 | 195,431 |
| 1986 | 15 | R | 0.0%0 | 100.0%115,284 | 115,284 |
| 1984 | 15 | R | 26.8%54,516 | 73.2%149,096 | 203,613 |
| 1982 | 15 | R | 33.7%53,303 | 66.3%105,038 | 158,344 |
| 1980 | 15 | R | 23.3%45,721 | 76.7%150,898 | 196,619 |
| 1978 | 15 | R | 37.6%48,756 | 62.4%80,856 | 129,612 |
| 1976 | 15 | R | 46.1%87,676 | 53.9%102,555 | 190,231 |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2022 | D | 56.8%2,329,136 | 41.5%1,701,055 | 4,098,896 |
| 2020 | D | 54.9%3,278,930 | 38.9%2,319,870 | 5,968,901 |
| 2016 | D | 54.9%3,012,940 | 39.8%2,184,692 | 5,491,239 |
| 2014 | D | 53.5%1,929,637 | 42.7%1,538,522 | 3,603,475 |
| 2010 | R | 46.4%1,719,478 | 48.0%1,778,698 | 3,703,370 |
| 2008 | D | 67.8%3,615,844 | 28.5%1,520,621 | 5,329,883 |
| 2004 | D | 70.0%3,597,456 | 27.1%1,390,690 | 5,138,563 |
| 2002 | D | 60.3%2,103,766 | 38.0%1,325,703 | 3,486,851 |
| 1998 | R | 47.4%1,610,496 | 50.3%1,709,041 | 3,394,521 |
| 1996 | D | 56.1%2,384,028 | 40.7%1,728,824 | 4,246,494 |
| 1992 | D | 53.3%2,631,229 | 43.1%2,126,833 | 4,939,530 |
| 1990 | D | 65.1%2,115,377 | 34.9%1,135,628 | 3,251,005 |
| 1986 | D | 65.1%2,033,783 | 33.7%1,053,734 | 3,122,883 |
| 1984 | D | 50.1%2,397,165 | 48.2%2,308,039 | 4,787,335 |
| 1980 | D | 56.0%2,565,302 | 42.5%1,946,296 | 4,579,933 |
| 1978 | R | 45.5%1,448,187 | 53.3%1,698,711 | 3,184,605 |
Illinois' 15th spans a vast swath of rural downstate territory where Republican presidential candidates have carried the district by margins exceeding 40 points in recent cycles, making it among the most lopsided congressional districts in the region.
Across the recorded series it reached a Republican high of 39.6 points in 2024. Between 2020 and 2024 the district moved 0.8 points toward the Republican candidate; the 2024 margin was 39.6 points.
A population of 753,516, a 91% non-Hispanic-white share, and a median household income of $73,993 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 12 and Congressional District 8.
The congressional districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Illinois 15th Congressional District. Akashic. https://akashic.app/cd/1715/. Accessed May 20, 2026. License: CC BY 4.0.