State Senate District 18 State Senate District (IL) — Elections 1876–2024

Illinois 18th State Senate District, Illinois: Democratic loyalist district. In 2024, voted D+42%. Democratic peak: D+53 in 2008.

Key facts

2024 presidential margin: D+42MIT Election Lab
Political archetype: Democratic loyalistAkashic typology
Population: 354,7242024 5-year
Median household income: $83,4982024 5-year
White (non-Hispanic): 43.6%2024 5-year
Black: 22.2%2024 5-year
Hispanic / Latino: 26.8%2024 5-year
Peak Democratic margin: D+53 in 2008MIT Election Lab
Peak Republican margin: R+49 in 1920MIT Election Lab

2024 results by constituent county

1 counties · 1 D · 0 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	+41.6%	99,106	39,966	142,328
2020	D	+50.2%	118,146	38,215	159,179
2016	D	+53.1%	110,341	31,028	149,249
2012	D	+49.3%	101,893	33,921	137,918
2008	D	+53.4%	111,510	33,387	146,314
2004	D	+41.1%	98,552	40,894	140,288
2000	D	+40.0%	87,656	36,590	127,725
1996	D	+40.1%	78,945	31,594	118,194
1992	D	+30.0%	85,533	41,434	146,943
1988	D	+12.4%	77,349	60,141	138,694
1984	D	+2.6%	76,162	72,255	149,276
1980	D	+12.4%	76,980	58,634	148,068
1976	D	+8.7%	80,829	67,596	151,262
1972	R	−7.4%	72,783	84,491	158,195
1968	D	+9.5%	80,863	65,748	159,941
1964	D	+26.4%	105,223	61,314	166,537
1960	D	+13.0%	94,350	72,532	167,384
1956	R	−13.9%	66,934	88,524	155,855
1952	R	−0.7%	80,257	81,388	162,090
1948	D	+8.9%	83,281	69,534	153,736
1944	D	+15.9%	87,301	63,295	151,018
1940	D	+10.9%	79,962	64,239	144,763
1936	D	+27.5%	85,782	47,999	137,551
1932	D	+13.8%	62,923	47,242	113,920
1928	R	−6.2%	49,031	55,587	105,428
1924	R	−41.6%	15,480	47,162	76,232
1920	R	−49.0%	13,519	43,480	61,137
1916	R	−6.6%	25,973	29,824	58,178
1912	O	+13.0%	8,947	5,124	29,387
1908	R	−18.6%	10,472	15,771	28,414
1904	R	−32.1%	7,103	15,734	26,898
1900	R	−4.4%	12,745	13,948	27,458
1896	R	−18.4%	10,415	15,184	25,985
1892	D	+12.8%	9,898	7,616	17,889
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

9.0%

Irish

8.4%

Polish

7.0%

Italian

4.8%

English

3.6%

American

2.2%

French

0.9%

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: 38.0 in this county, 39.1 nationally

Male

Age

Female

0.7%

85+

1.3%

1.9%

75–84

2.7%

4.3%

65–74

5.1%

5.9%

55–64

6.2%

6.1%

45–54

6.2%

7.0%

35–44

7.0%

7.9%

25–34

8.0%

4.3%

18–24

4.4%

8.0%

5–17

7.7%

2.8%

2.7%

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

Median household income

2024 inflation-adjusted dollars

$83,498

State Senate District 18 ranks near the middle of US counties.

State Senate District 18$83,498

Illinois$83,390

United States$80,734

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

Poverty rate

All persons below federal poverty line

13.5%

Children face moderate poverty.

Children under 1817.9%

Working age (18–64)12.2%

Seniors (65+)14.0%

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

Language at home

Population aged 5 and older

64.2%

speak English only

Spanish21.1%

Other Indo-European8.3%

Asian & Pacific Islander4.3%

Other languages2.1%

Source · ACS 5-year estimates, 2024.

Religious adherents

Adherents per capita by tradition

Catholic & Orthodox

29.6%

Non-Christian

7.7%

Other Christian

6.4%

Baptist

4.8%

Mainline Protestant

2.9%

Pentecostal & Holiness

1.8%

Methodist

1.0%

Source · 2020 US Religion Census. Remaining 45.8% of residents not counted as adherents by any reporting body.

With a 2024 presidential margin of D+68.1, this district registers among the most lopsided in the state, reflecting a dense, heavily urbanized constituency where competitive general elections are effectively absent.

The Democratic margin in Illinois 18th State Senate District reached its widest at fifty-three points in 2008. The margin in 2024 was forty-two points — still decisive.

Its loyalty is rooted in its place. Median household income of $83,498, a 44% non-Hispanic-white share, and a population of 354,724 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 18, Illinois. Akashic. https://akashic.app/sld-upper/17018/. Accessed May 20, 2026. License: CC BY 4.0.

License: CC BY 4.0

Frequently asked questions

How did State Senate District 18, Illinois vote in 2024?

In 2024, State Senate District 18, Illinois voted Democratic by 41.6 points (D+42), carried by the Democratic candidate. Out of 142,328 votes cast, 99,106 went Democratic and 39,966 went Republican.

What is State Senate District 18, Illinois's political archetype?

Akashic classifies State Senate District 18, 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 22 times, Republican 11 times, and other 1 times.

When did State Senate District 18, Illinois last vote Republican?

The most recent presidential election in which State Senate District 18, Illinois voted Republican was 1972.

How many people live in State Senate District 18, Illinois?

State Senate District 18, Illinois has a population of 354,724 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 18, Illinois?

Median household income in State Senate District 18, Illinois is $83,498 — above the national median of $80,734. The Illinois state median is $83,390.

What is the political history of State Senate District 18, Illinois?

Akashic tracks 38 presidential elections in State Senate District 18, Illinois from 1876 to 2024. Of those, 22 went Democratic and 11 went Republican. The district's archetype — "Democratic loyalist" — captures the overall trajectory of that voting record.

Illinois 18th State Senate District has voted Democratic in thirteen straight presidential cycles.

Key facts

Demographics

Compare two places, side by side

Frequently asked questions