Congressional District 15 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: 1,016,2642024 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

2024 results by constituent county

45 counties · 4 D · 41 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%	176,812	300,152	486,486
2020	R	−24.0%	188,063	310,504	511,053
2016	R	−24.0%	168,355	284,904	486,331
2012	R	−12.3%	197,215	254,198	462,821
2008	D	+0.1%	239,347	238,739	486,430
2004	R	−12.8%	209,848	271,821	485,587
2000	R	−5.7%	207,966	234,053	455,922
1996	D	+5.6%	203,596	179,688	430,555
1992	D	+10.0%	222,531	173,473	491,057
1988	R	−3.9%	212,129	229,443	444,025
1984	R	−19.6%	188,542	280,818	471,203
1980	R	−21.5%	169,308	270,355	470,410
1976	R	−3.4%	225,791	241,824	473,810
1972	R	−24.6%	174,543	288,731	464,880
1968	R	−10.2%	182,633	229,011	456,685
1964	D	+17.7%	271,321	189,579	460,911
1960	R	−9.5%	217,318	262,878	481,005
1956	R	−17.3%	189,517	269,062	459,037
1952	R	−15.2%	196,930	267,364	464,776
1948	R	−3.0%	192,360	204,327	400,092
1944	R	−6.6%	195,252	222,970	420,586
1940	R	−1.6%	244,553	252,474	500,809
1936	D	+12.3%	260,146	202,364	471,660
1932	D	+20.9%	254,789	165,209	428,249
1928	R	−22.2%	149,312	235,246	387,696
1924	R	−17.0%	124,646	185,466	357,800
1920	R	−24.3%	114,022	193,224	325,699
1916	D	+0.5%	179,813	178,078	371,947
1912	D	+20.0%	85,728	47,162	192,524
1908	R	−2.0%	95,817	100,037	206,647
1904	R	−12.3%	77,147	100,961	193,148
1900	D	+1.7%	104,306	100,796	210,196
1896	D	+1.9%	104,224	100,251	207,969
1892	D	+6.1%	89,175	78,169	181,494
1888	—	No data	—	—	—
1884	—	No data	—	—	—
1880	—	No data	—	—	—
1876	—	No data	—	—	—

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 Congressional District sits in the Upper Midwest. Its political identity has been Republican for as long as anyone now living can remember. 1 consecutive presidential elections in modern records have gone for the Republican candidate, often by margins that would be considered landslide territory anywhere else.

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 1,016,264 together describe a district whose political habits are deeply settled.

Cite this page

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

Congressional District 15, Illinois — The Long Memory. Akashic Intelligence — The Long Memory. https://tiers.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 486,486 votes cast, 176,812 went Democratic and 300,152 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 1,016,264 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 the long memory.

Key facts

Demographics

Frequently asked questions