99chambers

New Hampshire House of Representatives seat · lines in effect since 2022

New Hampshire House of Representatives: State House District Rockingham 21

A district of about 5,100 people, 66% of adults with a bachelor's degree. It votes D+31.7 relative to the nation for president.

Jennifer Mandelbaum (D) · since Nov 5, 2024Next election Nov 7, 2028The 2026 race →

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.

D+31.720th most
Democratic
Most DemocraticMost Republican83rd seat · the majority lineDistrict 721

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
U.S. SenateD+45.0
GovernorD+1.3

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 721.

Adults with a bachelor's degree66% 97th pct · 5th of 159 in NH

Higher than 97% of seats.

White adults without a degree27% 2nd pct · 156th of 159 in NH

Lower than 98% of seats.

Hispanic residents6% 84th pct · 26th of 159 in NH

Higher than 84% of seats.

Black residents0% 0th pct · 136th of 159 in NH

Lower than 100% of seats.

Asian residents4% 85th pct · 24th of 159 in NH

Higher than 85% of seats.

People per square mile357 55th pct · 72nd of 159 in NH

Denser than 55% 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 624
66% college gradsD+27.1Held DDistrict 711
59% college gradsD+33.7Held DDistrict 607
66% college gradsD+24.8Held DDistrict 712
70% college gradsD+20.9Held 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.

  1. Anna Howard (D)
    2027– · Won 2026 by 97.6
  2. Jennifer Mandelbaum (D)
    2025–2027 · Won 2024 by 97.5
  3. Robin Vogt (D)
    2023–2025 · Won 2022 by 98.9

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)