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state senate district

Illinois 55th State Senate District

Office (updates table and map)

President margin by year

Place winner margin

1876–2024 · D minus R

Full record · 1876 → 2024

2024

Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab

The precinct map shows the 2024 presidential vote; the timeline scrubs the district’s overall result across 1892–2024, on its current boundaries.

People and households

Who lives here

Exact values for this place, its state, and the United States.

Race · ethnicity · ancestry

Communities and origins

German30.9%16.1%12.5%

Irish12.5%10.6%9.4%

English12.3%6.9%9.5%

American7.0%3.3%5.3%

Italian3.4%5.4%4.8%

Polish2.4%6.0%2.2%

French2.1%0.7%1.6%

Scottish1.4%—1.3%

African American†2.6%12.1%9.9%

Mexican1.7%14.4%11.3%

Puerto Rican0.2%1.7%1.8%

Hispanic or Latino counts residents of any race; the race groups count only their non-Hispanic residents, so the groups are mutually exclusive and sum to 100%. Expand a row to see ancestries reported within that group.

Age and life stage

Measure	IL SD 55	Illinois	United States
Median age	41.3	39.1	39.1
Age 18–24	8.4%	9.1%	9.2%
Age 65 and older	19.1%	16.9%	17.2%

Household economy

Measure	IL SD 55	Illinois	United States
Median household income	$76,856	$83,390	$84,427
Poverty rate	9.8%	11.8%	12.5%
Bachelor's degree or higher (25+)	25.8%	37.9%	35.6%

Housing and tenure

Measure	IL SD 55	Illinois	United States
Owner-occupied homes	80.2%	67.1%	65.2%
Renter-occupied homes	19.8%	32.9%	34.8%
Median home value	$172,200	$263,300	$332,700
Median gross rent (monthly)	$837	$1,274	$1,413
Renters paying 30%+ of income	38.8%	47.9%	51.1%
Vacant housing units	8.8%	7.7%	10.1%

Getting to work

Measure	IL SD 55	Illinois	United States
Mean commute	25.0 min	27.8 min	26.4 min
Commutes 60 minutes or more	7.1%	9.8%	8.6%
Drives alone to work	80.0%	65.9%	68.8%
Takes public transit	0.2%	5.8%	3.2%
Works from home	9.8%	15.9%	15.1%

Languages at home

Measure	IL SD 55	Illinois	United States
Speaks a non-English language at home	3.4%	24.1%	22.3%
Spanish	2.0%	14.0%	13.6%

Religious landscape

Measure	IL SD 55	Illinois	United States
Catholic	—	24.2%	18.6%
Evangelical Protestant	—	11.7%	16.5%
Unclaimed / not counted	—	49.2%	51.5%

Origins and service

Measure	IL SD 55	Illinois	United States
Foreign-born residents	1.5%	14.7%	14.1%
Naturalized citizens	0.8%	7.7%	7.4%
Not U.S. citizens	0.7%	7.0%	6.8%
Veterans (18+)	8.8%	4.8%	6.2%
Income inequality (Gini)	0.444	0.481	0.483

American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations · American Community Survey 2024 — housing and tenure (B25003, B25002, B25077, B25064, B25070), commuting (B08013, B08303, B08301), origins and service (B05002, B21001, B19083).

President results by year

Modeled candidate-vote estimate on current district boundaries

HarrisDemocratic25.5%28,679TrumpRepublican72.7%81,966OtherAll other candidates1.8%2,024

R+47.3

Lead: 53,287
Total: 112,669
vs nation: R+45.8

modeled Census-place estimatemodeled estimate

BidenDemocratic25.6%29,118TrumpRepublican72.2%82,271OtherAll other candidates2.2%2,542

R+46.7

Lead: 53,153
Total: 113,931
vs nation: R+51.1

modeled Census-place estimatemodeled estimate

ClintonDemocratic23.9%25,145TrumpRepublican70.1%73,872OtherAll other candidates6.0%6,310

R+46.3

Lead: 48,727
Total: 105,327
vs nation: R+48.4

modeled Census-place estimatemodeled estimate

ObamaDemocratic34.8%34,228RomneyRepublican62.8%61,825OtherAll other candidates2.4%2,350

R+28.0

Lead: 27,597
Total: 98,403
vs nation: R+31.9

modeled Census-place estimatemodeled estimate

ObamaDemocratic42.8%44,461McCainRepublican55.2%57,372OtherAll other candidates2.0%2,066

R+12.4

Lead: 12,911
Total: 103,899
vs nation: R+19.7

modeled Census-place estimatemodeled estimate

KerryDemocratic38.6%39,417BushRepublican60.7%61,971OtherAll other candidates0.7%763

R+22.1

Lead: 22,554
Total: 102,151
vs nation: R+19.6

modeled Census-place estimatemodeled estimate

GoreDemocratic41.2%38,625BushRepublican57.0%53,386OtherAll other candidates1.8%1,640

R+15.8

Lead: 14,761
Total: 93,651
vs nation: R+16.3

modeled Census-place estimatemodeled estimate

ClintonDemocratic43.4%38,159DoleRepublican44.3%38,974OtherAll other candidates12.2%10,754

R+0.9

Lead: 815
Total: 87,887
vs nation: R+9.4

modeled Census-place estimatemodeled estimate

Key facts

2024 presidential margin: R+47.3MIT Election Lab
Population: 217,1122024 5-year
Population density: 54 / sq mi2024 5-year · TIGER/Line
Land area: 4,016 sq miTIGER/Line
Median household income: $76,8562024 5-year
White (non-Hispanic): 89.9%2024 5-year
Black: 2.7%2024 5-year
Hispanic / Latino: 2.6%2024 5-year
Peak Democratic margin: D+19.8 in 1932MIT Election Lab
Peak Republican margin: R+47.3 in 2024MIT Election Lab
Most similar: State Senate District 50, IL · twin score 98.3

presidential history

Party record book

Illinois 55th State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.

1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark

Largest share of the presidential candidate vote cast here.

Democratic

Franklin D. Roosevelt1932

58.8%

48,609 votes · D+19.8 · modeled estimate

Runner-up · Lyndon B. Johnson, 1964 · 57.5%

Republican

Donald Trump2024

72.7%

81,966 votes · R+47.3 · modeled estimate

Runner-up · Donald Trump, 2020 · 72.2%

Most votes

Largest number of votes cast for the party’s presidential nominee here.

Democratic

Lyndon B. Johnson1964

53,562votes

57.5% of the vote · D+15.0 · modeled estimate

Runner-up · Franklin D. Roosevelt, 1940 · 49,581 votes

Republican

Donald Trump2020

82,271votes

72.2% of the vote · R+46.7 · modeled estimate

Runner-up · Donald Trump, 2024 · 81,966 votes

Best relative to the U.S.

This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.

Democratic

John W. Davis1924

+10.3pts D vs U.S.

Place R+14.9 · U.S. R+25.2 · modeled estimate

Runner-up · William J. Bryan, 1896 · +9.1 pts

Republican

Donald Trump2020

+51.1pts R vs U.S.

Place R+46.7 · U.S. D+4.5 · modeled estimate

Runner-up · Donald Trump, 2016 · +48.4 pts

current representation

Current officeholders

RJason PlummerState Senate · 55

State legislative officeholder from OpenStates nightly current-legislator data.

U.S. House elections · 2 House

Senate and governor results are in the Office selector at the top of this page.

U.S. House

Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.

Source · Akashic county-allocated estimate from certified county returns, House; not precinct-counted.
Year	Vote lead	Democratic	Republican	Total
2024	R	22.3%22,395	77.7%78,028	100,423
2020	R	29.4%31,384	70.6%75,521	106,905

Illinois 55th State Senate District sits in the Upper Midwest. In 2024 it voted Republican.

Across the recorded series it reached a Democratic high of 19.8 points in 1932 and a Republican high of 47.3 points in 2024. Between 2020 and 2024 the district moved 0.6 points toward the Republican candidate; the 2024 margin was 47.3 points.

A population of 217,112, a 90% non-Hispanic-white share, and a median household income of $76,856 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 50 and State Senate District 54.

Political twins — state-senate districts

The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.

State Senate District 50

2016–2024 trajectoryelasticity

State Senate District 54

elasticity2016–2024 trajectory

State Senate District 26

elasticity2016–2024 trajectory

Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.

District research tools

Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →

Cite this page

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

Illinois 55th State Senate District. Akashic. https://akashic.app/sld-upper/17055/. Accessed May 20, 2026. License: CC BY 4.0.

License: CC BY 4.0

Illinois at the ballot boxAll elections →

Presidentcounty detail2024 US Senatestatewide2022 Governorstate + county2022 US Houseall districts2024

Places within Illinois 55th State Senate District

counties it covers11

Bond County Clay County Clinton County Effingham County Fayette County Madison County Marion County Montgomery County Richland County St. Clair County Washington County

Frequently asked questions

How did Illinois 55th State Senate District vote in 2024?

In 2024, Illinois 55th State Senate District voted Republican by 47.3 points (R+47.3), carried by the Republican candidate. Out of 112,669 votes cast, 28,679 went Democratic and 81,966 went Republican.

When did Illinois 55th State Senate District last vote Democratic?

The most recent presidential election in which Illinois 55th State Senate District voted Democratic was 1992.

How many people live in Illinois 55th State Senate District?

Illinois 55th State Senate District has a population of 217,112 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.

What is the median household income in Illinois 55th State Senate District?

Median household income in Illinois 55th State Senate District is $76,856 — below the national median of $80,734. The Illinois state median is $83,390.

What is the political history of Illinois 55th State Senate District?

Akashic tracks 38 presidential elections in Illinois 55th State Senate District from 1876 to 2024. Of those, 12 went Democratic and 26 went Republican.