congressional districtIllinois 15th Congressional District
presidential margin
2004–2024 · Democratic minus Republican
2004R+22.2
2008R+9.5
2012R+23.8
2016R+38.4
2020R+38.7
2024R+39.6
net swing · 2004→2024R+17.4R+22.2 → R+39.6
vs. U.S. · 2024R+38.1R+39.6 vs R+1.5
presidential returns
2024 turnout 66.2% of 578,827 citizens 18+
Year
Democrat
Republican
Others
Total
CVAP
Turnout
2024
111,486
263,044
8,441
382,971
578,827
66.2%
2020
116,973
270,125
8,135
395,233
591,189†
66.9%
2016
102,632
244,959
23,413
371,004
599,805†
61.9%
2012
131,723
216,580
8,629
356,932
601,008†
59.4%
2008
164,782
200,313
9,660
374,755
593,120†
63.2%
2004
144,859
228,213
2,403
375,475
585,232†
64.2%
† Citizen voting-age population estimated for prior cycles from the constituent-county ACS trend anchored to the current figure. Source: ACS 5-year, table B05003.
——
D+60R+60
20042024
District by 2024 margin · Precinct returns · VEST · MIT Election Lab
People and households
Who lives here
Exact values for this place, its state, and the United States.
Race · ethnicity · ancestry
Communities and origins
GroupIL-15IllinoisUnited States
German25.4%16.1%12.5%
English13.5%6.9%9.5%
Irish12.5%10.6%9.4%
American6.9%3.3%5.3%
Italian3.3%5.4%4.8%
French1.8%0.7%1.6%
Scottish1.8%—1.3%
Polish1.6%6.0%2.2%
African American†2.7%12.1%9.9%
Mexican1.8%14.4%11.3%
Puerto Rican0.2%1.7%1.8%
Hispanic or Latino counts residents of any race; the race groups count only their non-Hispanic residents, so the groups are mutually exclusive and sum to 100%. Expand a row to see ancestries reported within that group.
Age and life stage
Measure
IL-15
Illinois
United States
Median age
42.3
39.1
39.1
Age 18–24
10.6%
9.1%
9.2%
Age 65 and older
19.5%
16.9%
17.2%
Household economy
Measure
IL-15
Illinois
United States
Median household income
$73,993
$83,390
$84,427
Poverty rate
10.3%
11.8%
12.5%
Bachelor's degree or higher (25+)
28.2%
37.9%
35.6%
Languages at home
Measure
IL-15
Illinois
United States
Speaks a non-English language at home
6.1%
24.1%
22.3%
Spanish
2.5%
14.0%
13.6%
Religious landscape
Measure
IL-15
Illinois
United States
Catholic
—
24.2%
18.6%
Evangelical Protestant
—
11.7%
16.5%
Unclaimed / not counted
—
49.2%
51.5%
American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024 · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations.
Illinois 15th Congressional District
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
−22.2%
2008
−9.5%
2012
−23.8%
2016
−38.4%
2020
−38.7%
2024
−39.6%
DemocraticRepublican
6 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024). Swing · margin change from the prior cycle. vs U.S. · margin relative to the national result that year. Third-party votes in 2012 are allocated from certified county totals by this place's share of each county's two-party vote — that cycle's precinct source records two-party splits. † 2004 sub-county results are estimated: the source's block-level detail for this cycle was unreliable — either county/municipality-level consolidated reporting (COVID-era) or a precinct-to-block allocation that misplaced votes — so the figures are allocated from the constituent county totals in proportion to the place and scaled to certified totals.
Federal officeholders only. State and local officeholders are planned for the next data pass.
Congressional elections · 25 House races
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.
Source · MIT Election Lab (MEDSL), House. CC-BY 4.0.
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
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 90% 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.
Akashic
Political twins — districts
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 →
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All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Illinois 15th Congressional District. Akashic. https://akashic.app/cd/1715/. Accessed May 20, 2026. License: CC BY 4.0.
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How did Illinois 15th Congressional District vote in 2024?
In 2024, Illinois 15th Congressional District voted Republican by 39.6 points (R+39.6), carried by the Republican candidate. Out of 382,971 votes cast, 111,486 went Democratic and 263,044 went Republican.
How many people live in Illinois 15th Congressional District?
Illinois 15th Congressional District has a population of 753,516 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Illinois 15th Congressional District?
Median household income in Illinois 15th Congressional District is $73,993 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Illinois 15th Congressional District?
Akashic tracks 6 presidential elections in Illinois 15th Congressional District from 2004 to 2024. Of those, 0 went Democratic and 6 went Republican.
