state senate districtWisconsin 18th State Senate District
presidential margin
2004–2024 · Democratic minus Republican
2004D+0.7
2008D+19.7
2012D+10.9
2016D+3.2
2020D+8.5
2024D+8.7
net swing · 2004→2024D+8.1D+0.7 → D+8.7
vs. U.S. · 2024D+10.2D+8.7 vs R+1.5
presidential returns
2024 turnout 66.4% of 137,232 citizens 18+
Year
Democrat
Republican
Others
Total
CVAP
Turnout
2024
48,827
40,871
1,403
91,101
137,232
66.4%
2020
48,437
40,664
2,131
91,232
135,052†
67.6%
2016
40,796
38,059
6,696
85,551
132,381†
64.6%
2012
49,097
39,269
1,569
89,935
128,549†
70.0%
2008
51,959
34,582
1,473
88,014
124,978†
70.4%
2004
43,159
42,578
1,160
86,897
121,406†
71.6%
† 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
GroupWI SD 18WisconsinUnited States
German41.2%35.8%12.5%
Irish9.8%10.4%9.4%
Polish6.5%7.6%2.2%
English6.1%6.7%9.5%
Norwegian4.1%6.1%—
American3.9%3.4%5.3%
Dutch3.9%——
French2.9%2.2%1.6%
Mexican4.2%5.4%11.3%
Puerto Rican1.0%1.1%1.8%
Hmong2.8%1.0%—
Chinese0.4%0.4%1.3%
Asian Indian0.4%0.6%1.4%
African American†2.6%5.3%9.9%
African0.6%0.2%0.5%
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
WI SD 18
Wisconsin
United States
Median age
36.5
40.5
39.1
Age 18–24
10.6%
9.3%
9.2%
Age 65 and older
17.2%
18.5%
17.2%
Household economy
Measure
WI SD 18
Wisconsin
United States
Median household income
$68,765
$77,485
$84,427
Poverty rate
12.2%
10.6%
12.5%
Bachelor's degree or higher (25+)
31.5%
33.5%
35.6%
Languages at home
Measure
WI SD 18
Wisconsin
United States
Speaks a non-English language at home
6.3%
9.1%
22.3%
Spanish
2.6%
5.0%
13.6%
Other Asian & Pacific Island
1.7%
1.2%
1.1%
Religious landscape
Measure
WI SD 18
Wisconsin
United States
Catholic
—
21.0%
18.6%
Evangelical Protestant
—
14.5%
16.5%
Unclaimed / not counted
—
52.0%
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.
Wisconsin 18th State Senate District
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
+0.7%
2008
+19.7%
2012
+10.9%
2016
+3.2%
2020
+8.5%
2024
+8.7%
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
D
53.6%Harris48,827
44.9%Trump40,871
1.5%
D+8.7
D+0.2
D+10.2
91,101
D
53.1%Biden48,437
44.6%Trump40,664
2.3%
D+8.5
D+5.3
D+4.1
91,232
D
47.7%Clinton40,796
44.5%Trump38,059
7.8%
D+3.2
R+7.7
D+1.1
85,551
D
54.6%Obama49,097
43.7%Romney39,269
1.7%
D+10.9
R+8.8
D+7.1
89,935
D
59.0%Obama51,959
39.3%McCain34,582
1.7%
D+19.7
D+19.1
D+12.5
88,014
D
49.7%Kerry43,159
49.0%Bush42,578
1.3%
D+0.7
—
D+3.1
86,897
current representation
Current officeholders
DKristin Dassler-AlfheimState Senate · 18
State legislative officeholder from OpenStates nightly current-legislator data.
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 19.7 points in 2008. 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.
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.
Wisconsin 18th State Senate District. Akashic. https://akashic.app/sld-upper/55018/. Accessed May 20, 2026. License: CC BY 4.0.
How did Wisconsin 18th State Senate District vote in 2024?
In 2024, Wisconsin 18th State Senate District voted Democratic by 8.7 points (D+8.7), carried by the Democratic candidate. Out of 91,101 votes cast, 48,827 went Democratic and 40,871 went Republican.
How many people live in Wisconsin 18th State Senate District?
Wisconsin 18th State Senate District has a population of 178,262 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Wisconsin 18th State Senate District?
Median household income in Wisconsin 18th State Senate District is $68,765 — below the national median of $80,734. The Wisconsin state median is $77,485.
What is the political history of Wisconsin 18th State Senate District?
Akashic tracks 6 presidential elections in Wisconsin 18th State Senate District from 2004 to 2024. Of those, 6 went Democratic and 0 went Republican.
