- Lead
- 350
- Total
- 20,097
- vs nation
- R+0.3
Iowa 28th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 33
- Total
- 18,190
- vs nation
- R+4.3
- Lead
- 1,057
- Total
- 11,978
- vs nation
- R+10.9
- Lead
- 1,287
- Total
- 11,784
- vs nation
- R+14.8
- Lead
- 490
- Total
- 10,061
- vs nation
- R+12.1
- Lead
- 1,266
- Total
- 8,109
- vs nation
- R+13.2
- Lead
- 534
- Total
- 5,937
- vs nation
- R+9.5
- Lead
- 434
- Total
- 4,953
- vs nation
- D+0.2
Key facts
- 2024 presidential margin
- R+1.7MIT Election Lab
- Population
- 32,1372024 5-year
- Population density
- 345 / sq mi2024 5-year · TIGER/Line
- Land area
- 93.2 sq miTIGER/Line
- Median household income
- $98,1442024 5-year
- White (non-Hispanic)
- 81.8%2024 5-year
- Black
- 3.0%2024 5-year
- Hispanic / Latino
- 4.0%2024 5-year
- Peak Democratic margin
- D+32.4 in 1964MIT Election Lab
- Peak Republican margin
- R+51.7 in 1924MIT Election Lab
- Most similar
- State House District 27, IA · twin score 95.9
presidential history
Party record book
Iowa 28th 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
65.8%
2,281 votes · D+32.4 · modeled estimate
Runner-up · Michael Dukakis, 1988 · 60.3%
Republican
Warren G. Harding1920
70.4%
2,069 votes · R+43.3 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 70.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Kamala Harris2024
9,681votes
48.2% of the vote · R+1.7 · modeled estimate
Runner-up · Joe Biden, 2020 · 8,906 votes
Republican
Donald Trump2024
10,031votes
49.9% of the vote · R+1.7 · modeled estimate
Runner-up · Donald Trump, 2020 · 8,873 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
+29.0pts D vs U.S.
Place D+21.2 · U.S. R+7.7 · modeled estimate
Runner-up · Walter Mondale, 1984 · +22.6 pts
Republican
Calvin Coolidge1924
+26.5pts R vs U.S.
Place R+51.7 · U.S. R+25.2 · modeled estimate
Runner-up · Theodore Roosevelt, 1904 · +26.4 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.
The district recorded a Republican presidential margin of R+1.7 in 2024 and R+4.9 in 2008, switching sides at least once in between. In the 2024 ACS 5-year, 51.5% of adults held a bachelor's degree or higher.
Across the recorded series it reached a Democratic high of 32.4 points in 1964 and a Republican high of 51.7 points in 1924. Between 2020 and 2024 the district moved 1.9 points toward the Republican candidate; the 2024 margin was 1.7 points.
A population of 32,137, a 82% non-Hispanic-white share, and a median household income of $98,144 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 27 and State House District 46.
The state-house 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 →
Iowa 28th State House District. Akashic. https://akashic.app/sld-lower/19028/. Accessed May 20, 2026. License: CC BY 4.0.