Illinois 55th State Senate District, Illinois: Republican loyalist district. In 2024, voted R+42%. Republican peak: R+42 in 2024.
Key facts
- 2024 presidential margin
- R+42MIT Election Lab
- Political archetype
- Republican loyalistAkashic typology
- Population
- 215,9982024 5-year
- Median household income
- $71,1032024 5-year
- White (non-Hispanic)
- 88.1%2024 5-year
- Black
- 4.8%2024 5-year
- Hispanic / Latino
- 3.2%2024 5-year
- Peak Republican margin
- R+42 in 2024MIT Election Lab
Constituent county margins for State Senate District 55, ILOne cell per constituent county, colored by 2024 presidential margin from deep red (Republican) through neutral to deep blue (Democratic), ordered bluest first.
R+60D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
5 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 29,938 | 74,705 | 106,544 | ||
| R | 31,428 | 75,918 | 109,831 | ||
| R | 28,245 | 69,026 | 103,374 | ||
| R | 37,879 | 57,598 | 97,888 | ||
| R | 48,828 | 53,448 | 104,335 |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
30.1%
Irish
11.2%
English
11.1%
American
7.1%
Italian
2.6%
Polish
2.2%
French
1.9%
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: 41.1 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$71,103
State Senate District 55 ranks near the middle of US counties.
State Senate District 55$71,103
Illinois$83,390
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
12.0%
Child poverty is below the national average.
Children under 1814.5%
Working age (18–64)11.3%
Seniors (65+)10.2%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
96.7%
speak English only
Spanish1.8%
Other Indo-European0.9%
Asian & Pacific Islander0.4%
Other languages0.2%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 48.1% of residents not counted as adherents by any reporting body.
With a 2024 presidential margin of R+50.5, this downstate district ranks among the state's most reliably one-sided constituencies, where demographic and geographic patterns have produced consistent, lopsided results across cycles.
The Republican margin in Illinois 55th State Senate District reached its widest at forty-two points in 2024. The margin in 2024 was forty-two points, in line with the district's deep historical pattern.
Its loyalty is rooted in its place. Median household income of $71,103, a 88% non-Hispanic-white share, and a population of 215,998 together describe a district whose political habits are deeply settled.
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
State Senate District 55, Illinois — The Long Memory. Akashic Intelligence — The Long Memory. https://tiers.akashic.app/sld-upper/17055/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Frequently asked questions
How did State Senate District 55, Illinois vote in 2024?
In 2024, State Senate District 55, Illinois voted Republican by 42.0 points (R+42), carried by the Republican candidate. Out of 106,544 votes cast, 29,938 went Democratic and 74,705 went Republican.
What is State Senate District 55, Illinois's political archetype?
Akashic classifies State Senate District 55, Illinois as a "Republican loyalist" district based on its long-arc presidential voting pattern. Across 5 elections in the dataset, the district has voted Democratic 0 times, Republican 5 times, and other 0 times.
How many people live in State Senate District 55, Illinois?
State Senate District 55, Illinois has a population of 215,998 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 55, Illinois?
Median household income in State Senate District 55, Illinois is $71,103 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of State Senate District 55, Illinois?
Akashic tracks 5 presidential elections in State Senate District 55, Illinois from 2008 to 2024. Of those, 0 went Democratic and 5 went Republican. The district's archetype — "Republican loyalist" — captures the overall trajectory of that voting record.