Illinois 15th Congressional District (IL) — Elections 1876–2024

Illinois 15th Congressional District, Illinois: Republican loyalist district. In 2024, voted R+25%. Republican peak: R+25 in 2024.

Key facts

2024 presidential margin: R+25MIT Election Lab
Political archetype: Republican loyalistAkashic typology
Population: 1,016,2412024 5-year
Median household income: $68,1942024 5-year
White (non-Hispanic): 83.6%2024 5-year
Black: 7.1%2024 5-year
Hispanic / Latino: 4.1%2024 5-year
Peak Democratic margin: D+21 in 1932MIT Election Lab
Peak Republican margin: R+25 in 1972MIT Election Lab

MILLER, Mary E.Congress 119 · Republican

−1 liberal

+1 conservative

Predecessors: SHIMKUS, John M. (2019–2021), SHIMKUS, John M. (2017–2019), SHIMKUS, John M. (2015–2017), SHIMKUS, John M. (2013–2015)

Source · Voteview / Lewis, Poole, Rosenthal et al. (CC-BY).

2024 results by constituent county

35 counties · 1 D · 34 R

R+60

D+60

One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.

38 presidential elections

Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
Year	Won	Margin	Democratic	Republican	Total
2024	R	−25.4%	176,807	300,146	486,474
2020	R	−24.0%	188,058	310,498	511,042
2016	R	−24.0%	168,350	284,898	486,320
2012	R	−12.3%	197,210	254,193	462,810
2008	D	+0.1%	239,341	238,734	486,419
2004	R	−12.8%	209,842	271,816	485,576
2000	R	−5.7%	207,960	234,048	455,912
1996	D	+5.6%	203,591	179,684	430,545
1992	D	+10.0%	222,525	173,469	491,046
1988	R	−3.9%	212,124	229,438	444,016
1984	R	−19.6%	188,537	280,812	471,192
1980	R	−21.5%	169,304	270,349	470,400
1976	R	−3.4%	225,786	241,819	473,800
1972	R	−24.6%	174,539	288,726	464,870
1968	R	−10.2%	182,628	229,006	456,675
1964	D	+17.7%	271,315	189,575	460,901
1960	R	−9.5%	217,313	262,873	480,995
1956	R	−17.3%	189,513	269,057	459,028
1952	R	−15.2%	196,926	267,359	464,767
1948	R	−3.0%	192,356	204,324	400,084
1944	R	−6.6%	195,248	222,966	420,578
1940	R	−1.6%	244,548	252,470	500,800
1936	D	+12.3%	260,141	202,361	471,652
1932	D	+20.9%	254,784	165,207	428,241
1928	R	−22.2%	149,309	235,243	387,690
1924	R	−17.0%	124,644	185,463	357,795
1920	R	−24.3%	114,021	193,221	325,695
1916	D	+0.5%	179,811	178,075	371,942
1912	D	+20.0%	85,727	47,161	192,521
1908	R	−2.0%	95,816	100,036	206,644
1904	R	−12.3%	77,146	100,960	193,145
1900	D	+1.7%	104,305	100,795	210,194
1896	D	+1.9%	104,223	100,250	207,966
1892	D	+6.1%	89,174	78,168	181,492
1888	—	No data	—	—	—
1884	—	No data	—	—	—
1880	—	No data	—	—	—
1876	—	No data	—	—	—

Congressional elections · 16 Senate races

U.S. Senate

Source · MIT Election Lab (MEDSL), Senate. CC-BY 4.0.
Year	Won	D %	R %	Total
2022	O	0.0%	41.5%	4,098,896
2020	D	54.9%	38.9%	5,968,901
2016	D	54.9%	39.8%	5,491,878
2014	D	53.5%	42.7%	3,603,519
2010	R	46.4%	48.0%	3,704,473
2008	D	67.8%	28.5%	5,329,884
2004	D	70.0%	27.0%	5,141,520
2002	D	60.3%	38.0%	3,486,851
1998	R	47.4%	50.3%	3,394,521
1996	D	56.1%	40.7%	4,250,722
1992	D	53.3%	43.1%	4,939,558
1990	D	65.1%	34.9%	3,251,005
1986	D	65.1%	33.7%	3,122,883
1984	D	50.1%	48.2%	4,787,335
1980	D	56.0%	42.5%	4,580,029
1978	R	45.5%	53.3%	3,184,764

Demographics

Race, ethnicity, and ancestry

Click any group to see the ancestries typically reported within it.

German

23.2%

English

12.3%

Irish

11.4%

American

6.3%

Italian

3.0%

Polish

1.4%

Scottish

1.3%

Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.

Age distribution by sex

Median age: 40.1 in this county, 39.1 nationally

Male

Age

Female

0.9%

85+

1.5%

2.5%

75–84

3.3%

5.4%

65–74

5.9%

6.5%

55–64

6.6%

5.9%

45–54

5.7%

6.2%

35–44

6.0%

6.2%

25–34

5.9%

5.5%

18–24

5.1%

8.0%

5–17

7.6%

2.7%

2.6%

Source · American Community Survey 5-year estimates, 2024 release.

Median household income

2024 inflation-adjusted dollars

$68,194

Congressional District 15 ranks near the middle of US counties.

Congressional District 15$68,194

Illinois$83,390

United States$80,734

Source · American Community Survey 5-year estimates, 2024 release.

Poverty rate

All persons below federal poverty line

13.4%

Children face moderate poverty.

Children under 1815.2%

Working age (18–64)13.1%

Seniors (65+)9.8%

Source · American Community Survey 5-year estimates, 2024 release.

Language at home

Population aged 5 and older

93.9%

speak English only

Spanish2.5%

Other Indo-European1.8%

Asian & Pacific Islander1.5%

Other languages0.3%

Source · ACS 5-year estimates, 2024.

Religious adherents

Adherents per capita by tradition

Other Christian

12.8%

Catholic & Orthodox

12.0%

Mainline Protestant

7.1%

Baptist

5.4%

Methodist

4.9%

Pentecostal & Holiness

2.7%

Non-Christian

0.8%

Source · 2020 US Religion Census. Remaining 54.2% of residents not counted as adherents by any reporting body.

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.

The Republican margin in Illinois 15th Congressional District reached its widest at twenty-five points in 2024. The margin in 2024 was twenty-five points, in line with the district's deep historical pattern.

Its loyalty is rooted in its place. Median household income of $68,194, a 84% non-Hispanic-white share, and a population of 1,016,241 together describe a district whose political habits are deeply settled.

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 →

Cite this page

All citations released under CC BY 4.0. Attribution: Akashic Intelligence.

Congressional District 15, Illinois. Akashic. https://akashic.app/cd/1715/. Accessed May 20, 2026. License: CC BY 4.0.

License: CC BY 4.0

Frequently asked questions

How did Congressional District 15, Illinois vote in 2024?

In 2024, Congressional District 15, Illinois voted Republican by 25.4 points (R+25), carried by the Republican candidate. Out of 486,474 votes cast, 176,807 went Democratic and 300,146 went Republican.

What is Congressional District 15, Illinois's political archetype?

Akashic classifies Congressional District 15, Illinois as a "Republican loyalist" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 11 times, Republican 23 times, and other 0 times.

When did Congressional District 15, Illinois last vote Democratic?

The most recent presidential election in which Congressional District 15, Illinois voted Democratic was 2008.

How many people live in Congressional District 15, Illinois?

Congressional District 15, Illinois has a population of 1,016,241 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.

What is the median household income in Congressional District 15, Illinois?

Median household income in Congressional District 15, Illinois is $68,194 — below the national median of $80,734. The Illinois state median is $83,390.

What is the political history of Congressional District 15, Illinois?

Akashic tracks 38 presidential elections in Congressional District 15, Illinois from 1876 to 2024. Of those, 11 went Democratic and 23 went Republican. The district's archetype — "Republican loyalist" — captures the overall trajectory of that voting record.

Illinois 15th Congressional District delivered R+25 in 2024 — Republican for decades.

Key facts

U.S. Senate

Demographics

Compare two places, side by side

Frequently asked questions