- Lead
- 7,959
- Total
- 91,153
- vs nation
- D+10.2
Wisconsin 18th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 7,773
- Total
- 91,101
- vs nation
- D+4.1
- Lead
- 2,747
- Total
- 85,438
- vs nation
- D+1.1
- Lead
- 13,062
- Total
- 87,977
- vs nation
- D+11.0
- Lead
- 21,167
- Total
- 87,196
- vs nation
- D+17.0
- Lead
- 4,811
- Total
- 85,335
- vs nation
- D+8.1
- Lead
- 4,134
- Total
- 72,650
- vs nation
- D+5.2
- Lead
- 8,677
- Total
- 63,827
- vs nation
- D+5.1
Key facts
- 2024 presidential margin
- D+8.7MIT Election Lab
- Population
- 178,2622024 5-year
- Population density
- 2,153 / sq mi2024 5-year · TIGER/Line
- Land area
- 82.8 sq miTIGER/Line
- Median household income
- $68,7652024 5-year
- White (non-Hispanic)
- 80.6%2024 5-year
- Black
- 3.4%2024 5-year
- Hispanic / Latino
- 6.3%2024 5-year
- Peak Democratic margin
- D+33.2 in 1936MIT Election Lab
- Peak Republican margin
- R+40.2 in 1920MIT Election Lab
- Most similar
- State Senate District 30, WI · twin score 85.5
presidential history
Party record book
Wisconsin 18th 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
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Franklin D. Roosevelt1932
64.5%
17,286 votes · D+31.5 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 63.8%
Republican
Dwight D. Eisenhower1956
67.6%
23,325 votes · R+36.3 · modeled estimate
Runner-up · Warren G. Harding, 1920 · 65.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Barack Obama2008
53,338votes
61.2% of the vote · D+24.3 · modeled estimate
Runner-up · Barack Obama, 2012 · 49,660 votes
Republican
Donald Trump2024
40,829votes
44.8% of the vote · D+8.7 · modeled estimate
Runner-up · Donald Trump, 2020 · 40,600 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
Grover Cleveland1892
+18.3pts D vs U.S.
Place D+20.0 · U.S. D+1.7 · modeled estimate
Runner-up · Barack Obama, 2008 · +17.0 pts
Republican
Dwight D. Eisenhower1956
+20.9pts R vs U.S.
Place R+36.3 · U.S. R+15.4 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1952 · +18.1 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
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.
Centered in Milwaukee, this district delivered a 66-point Democratic margin in 2024, making it an outlier in a state where statewide races routinely land within a few percentage points.
Across the recorded series it reached a Democratic high of 33.2 points in 1936 and a Republican high of 40.2 points in 1920. The 2024 margin was 8.7 points.
A population of 178,262, a 81% non-Hispanic-white share, and a median household income of $68,765 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 30 and State Senate District 31.
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.
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 →
Wisconsin 18th State Senate District. Akashic. https://akashic.app/sld-upper/55018/. Accessed May 20, 2026. License: CC BY 4.0.