state house districtHawaii 21st State House District
presidential margin
2004–2024 · Democratic minus Republican
2004D+18.9
2008D+53.6
2012D+52.1
2016D+44.7
2020D+47.9
2024D+43.2
net swing · 2004→2024D+24.3D+18.9 → D+43.2
vs. U.S. · 2024D+44.7D+43.2 vs R+1.5
presidential returns
2024 turnout 55.5% of 20,271 citizens 18+
Year
Democrat
Republican
Others
Total
CVAP
Turnout
2024
7,953
3,090
208
11,251
20,271
55.5%
2020
9,379
3,245
184
12,808
19,588†
65.4%
2016
6,974
2,449
696
10,119
19,494†
51.9%
2012
7,806
2,412
137
10,355
18,708†
55.4%
2008
8,443
2,494
169
11,106
17,757†
62.5%
2004
5,993
4,067
122
10,182
16,807†
60.6%
† 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
GroupHI HD 21HawaiiUnited States
Filipino17.1%14.3%0.9%
Japanese15.6%11.7%0.2%
Chinese6.2%4.1%1.3%
Korean2.1%1.4%0.4%
Vietnamese1.2%0.8%0.6%
Asian Indian0.2%0.2%1.4%
Thai0.2%0.2%—
Laotian0.2%——
German5.5%5.8%12.5%
English4.5%5.1%9.5%
Irish4.4%4.7%9.4%
Portuguese2.4%3.2%—
Italian1.9%2.1%4.8%
American1.4%1.0%5.3%
French1.0%1.2%1.6%
Polish0.8%0.7%2.2%
Native Hawaiian5.8%6.1%—
Samoan1.4%0.9%—
Marshallese0.6%0.6%—
Chuukese0.5%0.3%—
Tongan0.3%0.3%—
Chamorro0.3%0.2%—
Mexican2.0%3.4%11.3%
Puerto Rican2.0%3.3%1.8%
Spanish0.8%1.3%—
Spaniard0.4%0.7%—
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
HI HD 21
Hawaii
United States
Median age
46.3
41
39.1
Age 18–24
8.7%
8.0%
9.2%
Age 65 and older
19.5%
20.5%
17.2%
Household economy
Measure
HI HD 21
Hawaii
United States
Median household income
$122,500
$100,389
$84,427
Poverty rate
10.0%
10.0%
12.5%
Bachelor's degree or higher (25+)
38.5%
36.2%
35.6%
Languages at home
Measure
HI HD 21
Hawaii
United States
Speaks a non-English language at home
26.0%
24.7%
22.3%
Spanish
2.0%
2.1%
13.6%
Chinese (incl. Mandarin & Cantonese)
3.4%
2.5%
1.1%
Tagalog (incl. Filipino)
4.9%
4.4%
0.6%
Other Asian & Pacific Island
11.5%
11.6%
1.1%
Religious landscape
Measure
HI HD 21
Hawaii
United States
Catholic
—
18.6%
18.6%
Evangelical Protestant
—
8.9%
16.5%
Unclaimed / not counted
—
59.7%
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.
Hawaii 21st State House District
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
+18.9%
2008
+53.6%
2012
+52.1%
2016
+44.7%
2020
+47.9%
2024
+43.2%
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
70.7%Harris7,953
27.5%Trump3,090
1.8%
D+43.2
R+4.7
D+44.7
11,251
D
73.2%Biden9,379
25.3%Trump3,245
1.4%
D+47.9
D+3.2
D+43.4
12,808
D
68.9%Clinton6,974
24.2%Trump2,449
6.9%
D+44.7
R+7.4
D+42.6
10,119
D
75.4%Obama7,806
23.3%Romney2,412
1.3%
D+52.1
R+1.5
D+48.2
10,355
D
76.0%Obama8,443
22.5%McCain2,494
1.5%
D+53.6
D+34.6
D+46.3
11,106
D
58.9%Kerry5,993
39.9%Bush4,067
1.2%
D+18.9
—
D+21.4
10,182
current representation
Current officeholders
DJackson SayamaState House · 21
State legislative officeholder from OpenStates nightly current-legislator data.
Anchored in urban Honolulu, this district has posted presidential margins exceeding 40 points in recent cycles, reflecting a dense, heavily Democratic electorate that leaves little competitive space for opposition candidates.
Across the recorded series it reached a Democratic high of 53.6 points in 2008. Between 2020 and 2024 the district moved 4.7 points toward the Republican candidate; the 2024 margin was 43.2 points.
A population of 27,188, a 17% non-Hispanic-white share, and a median household income of $122,500 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 20 and State House District 33.
Akashic
Political twins — state-house districts
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.
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 House District. Akashic. https://akashic.app/sld-lower/15021/. Accessed May 20, 2026. License: CC BY 4.0.
How did Hawaii 21st State House District vote in 2024?
In 2024, Hawaii 21st State House District voted Democratic by 43.2 points (D+43.2), carried by the Democratic candidate. Out of 11,251 votes cast, 7,953 went Democratic and 3,090 went Republican.
How many people live in Hawaii 21st State House District?
Hawaii 21st State House District has a population of 27,188 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 House District?
Median household income in Hawaii 21st State House District is $122,500 — above the national median of $80,734. The Hawaii state median is $100,389.
What is the political history of Hawaii 21st State House District?
Akashic tracks 6 presidential elections in Hawaii 21st State House District from 2004 to 2024. Of those, 6 went Democratic and 0 went Republican.
