- Lead
- 638
- Total
- 2,399
- vs nation
- D+28.1
New Hampshire State House District Merrimack 21
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 1,144
- Total
- 2,897
- vs nation
- D+35.0
- Lead
- 927
- Total
- 2,786
- vs nation
- D+31.2
- Lead
- 1,116
- Total
- 2,824
- vs nation
- D+35.7
- Lead
- 1,138
- Total
- 2,831
- vs nation
- D+32.9
- Lead
- 772
- Total
- 2,677
- vs nation
- D+31.3
- Lead
- 524
- Total
- 2,211
- vs nation
- D+23.2
- Lead
- 711
- Total
- 2,028
- vs nation
- D+26.5
Key facts
- 2024 presidential margin
- D+26.6MIT Election Lab
- Population
- 4,3102024 5-year
- Population density
- 1,105 / sq mi2024 5-year · TIGER/Line
- Land area
- 3.9 sq miTIGER/Line
- Median household income
- $117,2222024 5-year
- White (non-Hispanic)
- 90.0%2024 5-year
- Black
- 0.6%2024 5-year
- Hispanic / Latino
- 2.7%2024 5-year
- Peak Democratic margin
- D+43.7 in 1964MIT Election Lab
- Peak Republican margin
- R+20.9 in 1956MIT Election Lab
- Most similar
- State House District Merrimack 19, NH · twin score 95.3
presidential history
Party record book
New Hampshire State House District Merrimack 21 · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Lyndon B. Johnson1964
71.8%
842 votes · D+43.7 · modeled estimate
Runner-up · Barack Obama, 2008 · 69.2%
Republican
Dwight D. Eisenhower1956
60.5%
578 votes · R+20.9 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1952 · 56.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
1,997votes
68.9% of the vote · D+39.5 · modeled estimate
Runner-up · Barack Obama, 2008 · 1,958 votes
Republican
George W. Bush2004
941votes
35.2% of the vote · D+28.8 · modeled estimate
Runner-up · Donald Trump, 2024 · 855 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
Barack Obama2012
+35.7pts D vs U.S.
Place D+39.5 · U.S. D+3.9 · modeled estimate
Runner-up · Joe Biden, 2020 · +35.0 pts
Republican
William McKinley1896
+11.2pts R vs U.S.
Place R+17.3 · U.S. R+6.1 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1956 · +5.5 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
Merrimack 21 covers a slice of New Hampshire's capital city and returned a 26.9-point Democratic margin in 2024, making it among the strongest Democratic-leaning state house districts in a state otherwise known for competitive statewide races.
Across the recorded series it reached a Democratic high of 43.7 points in 1964 and a Republican high of 20.9 points in 1956. Between 2020 and 2024 the district moved 12.9 points toward the Republican candidate; the 2024 margin was 26.6 points.
A population of 4,310, a 90% non-Hispanic-white share, and a median household income of $117,222 describe the district. The district's voting pattern over the last decade is most similar to that of State House District Merrimack 19 and State House District Cheshire 08.
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.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
New Hampshire State House District Merrimack 21. Akashic. https://akashic.app/sld-lower/33621/. Accessed May 20, 2026. License: CC BY 4.0.