Akashic
1892–2024
Akashic
Hawaii 21st State Senate District
presidential margin
2008D+30.12012D+27.22016D+11.92020D+6.22024R+4.2
full record · 2008 → 2024
R+4.2
2024
median income$117,119U.S. $80,734 · HI $100,389
median age34.7U.S. 39.1 · HI 41
poverty rate9.1%U.S. 12.5% · HI 10.0%
bachelor’s+ (25+)38.5%U.S. 35.6% · HI 36.2%
non-english26.0%U.S. 22.3% · HI 24.7%
race · ethnicity · ancestry
Filipino12.8%
Japanese11.7%
Chinese4.7%
Native Hawaiian7.7%
Samoan1.8%
Marshallese0.8%
German4.2%
English3.4%
Irish3.3%
Mexican4.4%
Puerto Rican4.3%
Spanish1.6%
African American†1.8%
African0.2%
religion

Religious adherence is published only at the county level (U.S. Religion Census). See Honolulu County.

American Community Survey 2024 5-year (income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024.

Hawaii 21st State Senate District

Akashic
Hawaii 21st State Senate DistrictTrumpR+4.2
2024
2024 presidential margin for Hawaii 21st State Senate DistrictThe boundary of Hawaii 21st State Senate District, filled by its 2024 presidential margin (R+4.2), over faint outlines of the counties it is drawn from.Hawaii 21st State Senate District · R+4.2
How it voted
Share of the 2024 vote
Donald Trump ✓Republican51.2%10,054
Kamala HarrisDemocratic47.0%9,233
Jill SteinG1.7%338
D+60
R+60
District boundary, filled by its own 2024 D-vs-R margin — precinct detail where available, over the 1 county it's drawn from (shown faint).
The precinct map shows the 2024 presidential vote; the timeline scrubs the district’s overall result across 1892–2024, on its current boundaries.
County-level results (1 county) — table
2024 presidential result by county for Hawaii 21st State Senate District — winner and D-vs-R margin.
CountyWinnerMargin
Honolulu County, HIDemocraticD+21.7
5 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonDemocraticRepublicanOtherMarginTotal
R
47.0%Harris9,233
51.2%Trump10,054
1.7%Stein338
−4.2%
19,625
D
52.2%Biden11,061
46.0%Trump9,748
1.8%Jorgensen385
+6.2%
21,194
D
52.2%Clinton7,417
40.3%Trump5,731
7.4%Johnson1,058
+11.9%
14,206
D
63.6%Obama8,361
36.4%Romney4,782
0.0%
+27.2%
13,143
D
64.4%Obama8,612
34.3%McCain4,584
1.2%Nader167
+30.1%
13,363
presidential history
Presidential margin, 2008–2024
Democratic minus Republican, by election
Presidential margin over timeDemocratic-minus-Republican presidential margin from 2008 to 2024. Most recent: −4.2% in 2024.flipped R · 2024−4.2%DR20082024
Presidential margin over time
YearMargin (D minus R)
2008+30.1%
2012+27.2%
2016+11.9%
2020+6.2%
2024−4.2%
DemocraticRepublican
current representation
Current officeholders
DMike GabbardState Senate · 21

State legislative officeholder from OpenStates nightly current-legislator data.

Source · OpenStates current legislator CSV.

Anchored in urban Honolulu, this district delivers presidential margins exceeding 40 points, reflecting a dense, heavily Democratic electorate that has shown little competitive variation in recent cycles.

Across the recorded series it reached a Democratic high of 30.1 points in 2008 and a Republican high of 4.2 points in 2024. Between 2020 and 2024 the district moved 10.4 points toward the Republican candidate; the 2024 margin was 4.2 points.

A population of 59,486, a 14% non-Hispanic-white share, and a median household income of $117,119 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 20 and State Senate District 17.

Political twins — state-senate districts

The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.

State Senate District 20
Hawaii
98.3twin score
% Asian12-yr trend% White
State Senate District 17
Hawaii
95.6twin score
% Asian% White2008–2012 trajectory
State Senate District 18
Hawaii
91.6twin score
% Asian% White12-yr trend≠ elasticity

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.
Hawaii 21st State Senate District. Akashic. https://akashic.app/sld-upper/15021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Frequently asked questions

How did Hawaii 21st State Senate District vote in 2024?
In 2024, Hawaii 21st State Senate District voted Republican by 4.2 points (R+4.2), carried by the Republican candidate. Out of 19,625 votes cast, 9,233 went Democratic and 10,054 went Republican.
When did Hawaii 21st State Senate District last vote Democratic?
The most recent presidential election in which Hawaii 21st State Senate District voted Democratic was 2020.
How many people live in Hawaii 21st State Senate District?
Hawaii 21st State Senate District has a population of 59,486 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Hawaii 21st State Senate District?
Median household income in Hawaii 21st State Senate District is $117,119 — above the national median of $80,734. The Hawaii state median is $100,389.
What is the political history of Hawaii 21st State Senate District?
Akashic tracks 5 presidential elections in Hawaii 21st State Senate District from 2008 to 2024. Of those, 4 went Democratic and 1 went Republican.