state senate districtIllinois 55th State Senate District
presidential margin
2004–2024 · Democratic minus Republican
2004R+20.3
2008R+10.8
2012R+28.1
2016R+46.3
2020R+46.8
2024R+47.1
net swing · 2004→2024R+26.9R+20.3 → R+47.1
vs. U.S. · 2024R+45.7R+47.1 vs R+1.5
presidential returns
2024 turnout 67.8% of 166,734 citizens 18+
Year
Democrat
Republican
Others
Total
CVAP
Turnout
2024
28,680
81,965
2,407
113,052
166,734
67.8%
2020
29,119
82,275
2,270
113,664
167,457†
67.9%
2016
25,146
73,874
6,229
105,249
169,227†
62.2%
2012
34,037
61,638
2,418
98,093
169,299†
57.9%
2008
45,072
56,261
2,735
104,068
166,371†
62.6%
2004
40,173
60,747
625
101,545
163,443†
62.1%
† Citizen voting-age population estimated for prior cycles from the constituent-county ACS trend anchored to the current figure. Source: ACS 5-year, table B05003.
——
D+60R+60
20042024
Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab
People and households
Who lives here
Exact values for this place, its state, and the United States.
Race · ethnicity · ancestry
Communities and origins
GroupIL SD 55IllinoisUnited States
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%
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%
American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024 · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations.
Illinois 55th State Senate District
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
−20.3%
2008
−10.8%
2012
−28.1%
2016
−46.3%
2020
−46.8%
2024
−47.1%
DemocraticRepublican
6 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024). Swing · margin change from the prior cycle. vs U.S. · margin relative to the national result that year. Third-party votes in 2012 are allocated from certified county totals by this place's share of each county's two-party vote — that cycle's precinct source records two-party splits. † 2004 sub-county results are estimated: the source's block-level detail for this cycle was unreliable — either county/municipality-level consolidated reporting (COVID-era) or a precinct-to-block allocation that misplaced votes — so the figures are allocated from the constituent county totals in proportion to the place and scaled to certified totals.
Year
Won
Democratic
Republican
Other
Margin
Swing
vs U.S.
Total
R
25.4%Harris28,680
72.5%Trump81,965
2.1%
R+47.1
R+0.4
R+45.7
113,052
R
25.6%Biden29,119
72.4%Trump82,275
2.0%
R+46.8
R+0.5
R+51.2
113,664
R
23.9%Clinton25,146
70.2%Trump73,874
5.9%
R+46.3
R+18.2
R+48.4
105,249
R
34.7%Obama34,037
62.8%Romney61,638
2.5%
R+28.1
R+17.4
R+32.0
98,093
R
43.3%Obama45,072
54.1%McCain56,261
2.6%
R+10.8
D+9.5
R+18.0
104,068
R
39.6%Kerry40,173
59.8%Bush60,747
0.6%
R+20.3
—
R+17.8
101,545
current representation
Current officeholders
RJason PlummerState Senate · 55
State legislative officeholder from OpenStates nightly current-legislator data.
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.
Across the recorded series it reached a Republican high of 47.1 points in 2024. The 2024 margin was 47.1 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.
Akashic
Political twins — state-senate districts
The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
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.
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. 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.
How did Illinois 55th State Senate District vote in 2024?
In 2024, Illinois 55th State Senate District voted Republican by 47.1 points (R+47.1), carried by the Republican candidate. Out of 113,052 votes cast, 28,680 went Democratic and 81,965 went Republican.
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 6 presidential elections in Illinois 55th State Senate District from 2004 to 2024. Of those, 0 went Democratic and 6 went Republican.
