Hawaii State Senate seat · lines in effect since 2022
Hawaii Senate District 21
A district of about 59,000 people, 32% Asian, 28% of adults with a bachelor's degree. It votes R+1.6 relative to the nation for president.
Where it sits among all 25 seats
Every Hawaii State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2022 | 2024 | |
|---|---|---|
| U.S. Senate | No race | D+14.0 |
| Hawaii State Senate | D+17.8 | No race |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 7, 2026, 3:01 PM ET
Who lives here, compared
Grey bars show the spread of all 25 seats. Small marks are other seats in Hawaii. The black marker is District 21.
Lower than 88% of seats.
Lower than 62% of seats.
Higher than 96% of seats.
Higher than 92% of seats.
Lower than 58% of seats.
Denser than 67% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 2035% college gradsR+3.2CountingDistrict 22
HawaiiR+9.3Not up in 2026District 15
30% college gradsD+15.8Held DDistrict 17
36% college gradsD+17.8Held D
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Who has held it
These lines took effect in 2022.
- Mike Gabbard (D)
2023– · Won 2022 by 17.8, 2026 unopposed
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)