HarrisDemocratic35.4%5,368TrumpRepublican62.2%9,429OtherAll other candidates2.4%363
R+26.8- Lead
- 4,061
- Total
- 15,160
- vs nation
- R+25.3
modeled Census-place estimatemodeled estimate
Akashicstate house district
Iowa 100th State House District
Office (updates table and map)
President margin by year
Place winner margin
Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab
The precinct map shows the 2024 presidential vote; the timeline scrubs the district’s overall result across 1892–2024, on its current boundaries.
President results by year
Modeled candidate-vote estimate on current district boundaries
BidenDemocratic39.5%6,194TrumpRepublican58.0%9,093OtherAll other candidates2.6%403
R+18.5- Lead
- 2,899
- Total
- 15,690
- vs nation
- R+22.9
modeled Census-place estimatemodeled estimate
ClintonDemocratic38.4%5,914TrumpRepublican53.4%8,228OtherAll other candidates8.3%1,272
R+15.0- Lead
- 2,314
- Total
- 15,414
- vs nation
- R+17.1
modeled Census-place estimatemodeled estimate
ObamaDemocratic57.2%10,195RomneyRepublican40.7%7,264OtherAll other candidates2.1%370
D+16.4- Lead
- 2,931
- Total
- 17,829
- vs nation
- D+12.6
modeled Census-place estimatemodeled estimate
ObamaDemocratic57.4%9,334McCainRepublican40.6%6,604OtherAll other candidates2.0%325
D+16.8- Lead
- 2,730
- Total
- 16,263
- vs nation
- D+9.5
modeled Census-place estimatemodeled estimate
KerryDemocratic57.3%9,650BushRepublican41.4%6,975OtherAll other candidates1.3%227
D+15.9- Lead
- 2,675
- Total
- 16,852
- vs nation
- D+18.3
modeled Census-place estimatemodeled estimate
GoreDemocratic58.5%9,150BushRepublican37.9%5,921OtherAll other candidates3.6%559
D+20.7- Lead
- 3,229
- Total
- 15,630
- vs nation
- D+20.1
modeled Census-place estimatemodeled estimate
ClintonDemocratic56.8%8,412DoleRepublican31.1%4,603OtherAll other candidates12.2%1,806
D+25.7- Lead
- 3,809
- Total
- 14,821
- vs nation
- D+17.2
modeled Census-place estimatemodeled estimate
Key facts
- 2024 presidential margin
- R+26.8MIT Election Lab
- Population
- 31,8712024 5-year
- Population density
- 74 / sq mi2024 5-year · TIGER/Line
- Land area
- 428 sq miTIGER/Line
- Median household income
- $61,1172024 5-year
- White (non-Hispanic)
- 88.8%2024 5-year
- Black
- 2.8%2024 5-year
- Hispanic / Latino
- 3.3%2024 5-year
- Peak Democratic margin
- D+32.7 in 1964MIT Election Lab
- Peak Republican margin
- R+33.6 in 1920MIT Election Lab
- Most similar
- State House District 66, IA · twin score 96.4
presidential history
Party record book
Iowa 100th State House 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
66.3%
11,650 votes · D+32.7 · modeled estimate
Runner-up · Michael Dukakis, 1988 · 63.5%
Republican
Warren G. Harding1920
65.6%
10,063 votes · R+33.6 · modeled estimate
Runner-up · Donald Trump, 2024 · 62.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Lyndon B. Johnson1964
11,650votes
66.3% of the vote · D+32.7 · modeled estimate
Runner-up · Michael Dukakis, 1988 · 10,374 votes
Republican
Dwight D. Eisenhower1952
11,488votes
58.1% of the vote · R+16.6 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 10,888 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
+35.6pts D vs U.S.
Place D+27.9 · U.S. R+7.7 · modeled estimate
Runner-up · Bill Clinton, 1992 · +21.9 pts
Republican
Donald Trump2024
+25.3pts R vs U.S.
Place R+26.8 · U.S. R+1.5 · modeled estimate
Runner-up · Donald Trump, 2020 · +22.9 pts
current representation
Current officeholders
RBlaine WatkinsState House · 100
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.
With a 2024 presidential margin of R+26.8, this sparsely populated district of roughly 32,000 residents reflects the strong Republican lean that defines much of rural southwestern Iowa's political landscape.
Across the recorded series it reached a Democratic high of 32.7 points in 1964 and a Republican high of 33.6 points in 1920. Between 2020 and 2024 the district moved 8.3 points toward the Republican candidate; the 2024 margin was 26.8 points.
A population of 31,871, a 89% non-Hispanic-white share, and a median household income of $61,117 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 66 and State House District 68.
Political twins — state-house districts
The state-house districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
State House District 66
Iowa
96.4twin score
12-yr trendelasticity2024 margin
State House District 68
Iowa
94.9twin score
12-yr trendelasticity2020–2024 trajectory≠ Norwegian ancestry
State House District 99
Iowa
94.4twin score
12-yr trendelasticitycollege share
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 →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Iowa 100th State House District. Akashic. https://akashic.app/sld-lower/19100/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Places within Iowa 100th State House District
counties it covers1
Frequently asked questions
How did Iowa 100th State House District vote in 2024?
In 2024, Iowa 100th State House District voted Republican by 26.8 points (R+26.8), carried by the Republican candidate. Out of 15,160 votes cast, 5,368 went Democratic and 9,429 went Republican.
When did Iowa 100th State House District last vote Democratic?
The most recent presidential election in which Iowa 100th State House District voted Democratic was 2012.
How many people live in Iowa 100th State House District?
Iowa 100th State House District has a population of 31,871 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Iowa 100th State House District?
Median household income in Iowa 100th State House District is $61,117 — below the national median of $80,734. The Iowa state median is $75,059.
What is the political history of Iowa 100th State House District?
Akashic tracks 38 presidential elections in Iowa 100th State House District from 1876 to 2024. Of those, 22 went Democratic and 16 went Republican.