New Hampshire House of Representatives seat · lines in effect since 2022
New Hampshire House of Representatives: State House District Hillsborough 21
A district of about 8,300 people, 58% of adults with a bachelor's degree. It votes D+11.2 relative to the nation for president.
Where it sits among all 164 seats
Every New Hampshire House of Representatives 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.
| 2020 | 2022 | 2024 | |
|---|---|---|---|
| U.S. Senate | D+28.6 | No race | No race |
| Governor | R+24.1 | No race | No race |
| New Hampshire House of Representatives | No race | D+18.9 | D+4.1 |
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 164 seats. Small marks are other seats in New Hampshire. The black marker is District 521.
Higher than 89% of seats.
Lower than 89% of seats.
Higher than 71% of seats.
Higher than 84% of seats.
Higher than 75% of seats.
Denser than 89% 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 51747% college gradsD+10.7Held DDistrict 512
50% college gradsD+3.3Held DDistrict 723
54% college gradsD+15.1Held DDistrict 504
48% college gradsD+14.7Held 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.
- Democratic (D)
2027– · Won 2026 by 46.4 - Matthew B. Wilhelm (D)
2025–2027 · Won 2024 by 4.1 - Jeff Goley (D)
2023–2025 · Won 2022 by 20.2 - Christine Seibert (D)
2023–2027 · Won 2022 by 18.9, 2024 by 12.1
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)