State Senate District 40 State Senate District (IL) — Elections 1876–2024

Illinois 40th State Senate District, Illinois: Democratic loyalist district. In 2024, voted D+7%. Republican peak: R+55 in 1920.

Key facts

2024 presidential margin: D+7MIT Election Lab
Political archetype: Democratic loyalistAkashic typology
Population: 420,8512024 5-year
Median household income: $98,5072024 5-year
White (non-Hispanic): 59.4%2024 5-year
Black: 14.6%2024 5-year
Hispanic / Latino: 20.5%2024 5-year
Peak Democratic margin: D+21 in 2008MIT Election Lab
Peak Republican margin: R+55 in 1920MIT Election Lab

2024 results by constituent county

4 counties · 2 D · 2 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	D	+7.0%	99,010	85,824	188,879
2020	D	+14.3%	113,270	84,479	201,926
2016	D	+14.4%	98,323	72,154	181,782
2012	D	+14.3%	94,469	70,442	167,869
2008	D	+21.4%	104,956	67,556	174,596
2004	D	+5.5%	82,505	73,894	157,438
2000	D	+9.3%	69,105	57,047	129,497
1996	D	+15.9%	57,305	40,198	107,900
1992	D	+11.6%	55,701	41,839	120,005
1988	R	−6.4%	48,603	55,312	104,705
1984	R	−14.7%	46,549	62,660	109,967
1980	R	−9.2%	45,222	55,251	108,803
1976	R	−2.5%	51,752	54,502	108,118
1972	R	−21.6%	40,273	62,585	103,318
1968	R	−3.3%	42,305	45,583	98,621
1964	D	+19.0%	59,326	40,361	99,687
1960	D	+3.9%	51,081	47,263	98,530
1956	R	−22.3%	34,196	53,822	88,192
1952	R	−8.7%	40,490	48,245	88,949
1948	D	+0.9%	39,413	38,740	78,741
1944	D	+4.5%	40,825	37,312	78,419
1940	D	+2.6%	40,893	38,813	80,010
1936	D	+17.6%	41,773	28,828	73,752
1932	D	+9.3%	34,661	28,601	64,999
1928	R	−8.0%	27,114	31,858	59,435
1924	R	−47.1%	7,455	28,498	44,693
1920	R	−54.5%	7,344	27,287	36,578
1916	R	−17.9%	14,852	21,569	37,442
1912	O	+6.5%	5,656	4,401	19,306
1908	R	−27.0%	6,424	11,578	19,109
1904	R	−42.0%	4,093	11,531	17,713
1900	R	−17.7%	7,550	10,871	18,814
1896	R	−21.9%	6,833	10,727	17,812
1892	D	+0.8%	6,719	6,615	13,728
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

15.1%

Irish

11.6%

Polish

9.0%

Italian

7.2%

English

5.2%

American

2.5%

French

1.7%

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: 38.8 in this county, 39.1 nationally

Male

Age

Female

0.6%

85+

1.1%

2.0%

75–84

2.6%

4.4%

65–74

4.8%

6.3%

55–64

6.4%

6.7%

45–54

6.7%

35–44

6.8%

6.6%

25–34

6.4%

4.6%

18–24

4.4%

8.9%

5–17

8.5%

2.8%

2.7%

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

Median household income

2024 inflation-adjusted dollars

$98,507

State Senate District 40 ranks near the middle of US counties.

State Senate District 40$98,507

Illinois$83,390

United States$80,734

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

Poverty rate

All persons below federal poverty line

9.4%

Child poverty is below the national average.

Children under 1812.5%

Working age (18–64)8.4%

Seniors (65+)10.2%

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

Language at home

Population aged 5 and older

76.0%

speak English only

Spanish14.5%

Other Indo-European5.5%

Asian & Pacific Islander2.8%

Other languages1.2%

Source · ACS 5-year estimates, 2024.

Religious adherents

Adherents per capita by tradition

Catholic & Orthodox

25.6%

Other Christian

6.1%

Pentecostal & Holiness

3.7%

Non-Christian

3.6%

Mainline Protestant

3.5%

Baptist

2.4%

Methodist

1.4%

Source · 2020 US Religion Census. Remaining 53.6% of residents not counted as adherents by any reporting body.

With a D+64.3 margin in 2024, this Chicago-area district ranks among the most heavily concentrated Democratic-voting state senate districts in Illinois, reflecting dense urban population patterns that consistently produce outsized partisan differentials.

The Democratic margin in Illinois 40th State Senate District reached its widest at twenty-one points in 2008. The margin in 2024 was seven points — still decisive.

Its loyalty is rooted in its place. Median household income of $98,507, a 59% non-Hispanic-white share, and a population of 420,851 together describe a district whose political habits are deeply settled.

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Cite this page

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

State Senate District 40, Illinois. Akashic. https://akashic.app/sld-upper/17040/. Accessed May 20, 2026. License: CC BY 4.0.

License: CC BY 4.0

Frequently asked questions

How did State Senate District 40, Illinois vote in 2024?

In 2024, State Senate District 40, Illinois voted Democratic by 7.0 points (D+7), carried by the Democratic candidate. Out of 188,879 votes cast, 99,010 went Democratic and 85,824 went Republican.

What is State Senate District 40, Illinois's political archetype?

Akashic classifies State Senate District 40, Illinois as a "Democratic loyalist" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 17 times, Republican 16 times, and other 1 times.

When did State Senate District 40, Illinois last vote Republican?

The most recent presidential election in which State Senate District 40, Illinois voted Republican was 1988.

How many people live in State Senate District 40, Illinois?

State Senate District 40, Illinois has a population of 420,851 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.

What is the median household income in State Senate District 40, Illinois?

Median household income in State Senate District 40, Illinois is $98,507 — above the national median of $80,734. The Illinois state median is $83,390.

What is the political history of State Senate District 40, Illinois?

Akashic tracks 38 presidential elections in State Senate District 40, Illinois from 1876 to 2024. Of those, 17 went Democratic and 16 went Republican. The district's archetype — "Democratic loyalist" — captures the overall trajectory of that voting record.

Illinois 40th State Senate District has voted Democratic in nine straight presidential cycles.

Key facts

Demographics

Compare two places, side by side

Frequently asked questions