Illinois 55th State Senate District
Akashic| Donald Trump ✓Republican | 72.5% | 81,965 |
|---|---|---|
| Kamala HarrisDemocratic | 25.4% | 28,680 |
| Robert F. Kennedy Jr.Independent | 2.1% | 2,407 |
County-level results (11 counties) — table
| County | Winner | Margin |
|---|---|---|
| Bond County, IL | Republican | R+44.7 |
| Clay County, IL | Republican | R+67.3 |
| Clinton County, IL | Republican | R+51.8 |
| Effingham County, IL | Republican | R+60.3 |
| Fayette County, IL | Republican | R+64.7 |
| Madison County, IL | Republican | R+13.2 |
| Marion County, IL | Republican | R+49.5 |
| Montgomery County, IL | Republican | R+44.0 |
| Richland County, IL | Republican | R+53.4 |
| St. Clair County, IL | Democratic | D+7.8 |
| Washington County, IL | Republican | R+57.2 |
| Year | Won | Democratic | Republican | Other | Margin | Total |
|---|---|---|---|---|---|---|
| R | 25.4%Harris28,680 | 72.5%Trump81,965 | 2.1%Kennedy2,407 | 113,052 | ||
| R | 25.6%Biden29,119 | 72.4%Trump82,275 | 2.0%Jorgensen2,270 | 113,664 | ||
| R | 23.9%Clinton25,146 | 70.2%Trump73,874 | 5.9%Johnson6,229 | 105,249 | ||
| R | 35.6%Obama34,037 | 64.4%Romney61,638 | 0.0% | 95,675 | ||
| R | 43.3%Obama45,072 | 54.1%McCain56,261 | 2.6%Nader2,735 | 104,068 |
| Year | Margin (D minus R) |
|---|---|
| 2008 | −10.8% |
| 2012 | −28.8% |
| 2016 | −46.3% |
| 2020 | −46.8% |
| 2024 | −47.1% |
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 91% 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.
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 →
Illinois 55th State Senate District. Akashic. https://akashic.app/sld-upper/17055/. Accessed May 20, 2026. License: CC BY 4.0.