Iowa 13th 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
Lyndon B. Johnson1964
68.6%
24,764 votes · D+37.5 · modeled estimate
Runner-up · Michael Dukakis, 1988 · 61.5%
Republican
Donald Trump2024
69.5%
19,975 votes · R+40.5 · modeled estimate
Runner-up · Donald Trump, 2020 · 66.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Franklin D. Roosevelt1940
24,935votes
54.1% of the vote · D+8.8 · modeled estimate
Runner-up · Lyndon B. Johnson, 1964 · 24,764 votes
Republican
Herbert Hoover1928
25,144votes
63.8% of the vote · R+27.5 · modeled estimate
Runner-up · Warren G. Harding, 1920 · 23,449 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
Michael Dukakis1988
+31.8pts D vs U.S.
Place D+24.1 · U.S. R+7.7 · modeled estimate
Runner-up · Walter Mondale, 1984 · +30.5 pts
Republican
Donald Trump2024
+39.0pts R vs U.S.
Place R+40.5 · U.S. R+1.5 · modeled estimate
Runner-up · Donald Trump, 2020 · +38.1 pts
current representation
Current officeholders
RCherielynn WestrichState Senate · 13
State legislative officeholder from OpenStates nightly current-legislator data.
U.S. House elections · 3 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
31.2%8,674
68.8%19,102
27,776
2020
R
36.4%10,340
63.6%18,061
28,401
2018
R
48.3%10,410
51.7%11,164
21,574
The district recorded a Republican presidential margin of R+40.5 in 2024 and D+5.1 in 2008, switching sides at least once in between. About 61,900 residents lived here, with White alone at 85.9% in the 2024 ACS 5-year.
Across the recorded series it reached a Democratic high of 37.5 points in 1964 and a Republican high of 40.5 points in 2024. Between 2020 and 2024 the district moved 6.9 points toward the Republican candidate; the 2024 margin was 40.5 points.
A population of 63,740, a 85% non-Hispanic-white share, and a median household income of $63,947 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 48 and State Senate District 44.
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 → · Or open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Iowa 13th State Senate District. Akashic. https://akashic.app/sld-upper/19013/. Accessed May 20, 2026. License: CC BY 4.0.
How did Iowa 13th State Senate District vote in 2024?
In 2024, Iowa 13th State Senate District voted Republican by 40.5 points (R+40.5), carried by the Republican candidate. Out of 28,729 votes cast, 8,352 went Democratic and 19,975 went Republican.
When did Iowa 13th State Senate District last vote Democratic?
The most recent presidential election in which Iowa 13th State Senate District voted Democratic was 2012.
How many people live in Iowa 13th State Senate District?
Iowa 13th State Senate District has a population of 63,740 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Iowa 13th State Senate District?
Median household income in Iowa 13th State Senate District is $63,947 — below the national median of $80,734. The Iowa state median is $75,059.
What is the political history of Iowa 13th State Senate District?
Akashic tracks 38 presidential elections in Iowa 13th State Senate District from 1876 to 2024. Of those, 20 went Democratic and 18 went Republican.