- Lead
- 6,183
- Total
- 11,409
- vs nation
- D+55.7
Massachusetts 121st State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 8,615
- Total
- 13,043
- vs nation
- D+61.6
- Lead
- 7,694
- Total
- 12,372
- vs nation
- D+60.1
- Lead
- 7,234
- Total
- 11,541
- vs nation
- D+58.8
- Lead
- 7,415
- Total
- 11,627
- vs nation
- D+56.5
- Lead
- 7,084
- Total
- 10,973
- vs nation
- D+67.0
- Lead
- 6,828
- Total
- 10,140
- vs nation
- D+66.8
- Lead
- 6,467
- Total
- 9,286
- vs nation
- D+61.1
Key facts
- 2024 presidential margin
- D+54.2MIT Election Lab
- Population
- 42,5142024 5-year
- Population density
- 9,662 / sq mi2024 5-year · TIGER/Line
- Land area
- 4.4 sq miTIGER/Line
- Median household income
- $68,7412024 5-year
- White (non-Hispanic)
- 17.6%2024 5-year
- Black
- 36.7%2024 5-year
- Hispanic / Latino
- 13.3%2024 5-year
- Peak Democratic margin
- D+79.2 in 1964MIT Election Lab
- Most similar
- 6th Suffolk District, MA · twin score 95.7
presidential history
Party record book
Massachusetts 121st State House District · 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
89.6%
5,933 votes · D+79.2 · modeled estimate
Runner-up · Joe Biden, 2020 · 82.3%
Republican
William McKinley1896
48.0%
218 votes · D+0.7 · modeled estimate
Runner-up · Warren G. Harding, 1920 · 45.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
10,740votes
82.3% of the vote · D+66.1 · modeled estimate
Runner-up · Hillary Clinton, 2016 · 9,774 votes
Republican
Donald Trump2024
2,464votes
21.6% of the vote · D+54.2 · modeled estimate
Runner-up · Mitt Romney, 2012 · 2,139 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
George McGovern1972
+79.8pts D vs U.S.
Place D+56.7 · U.S. R+23.2 · modeled estimate
Runner-up · John Kerry, 2004 · +67.0 pts
Republican
William McKinley1896
−6.7pts R vs U.S.
Place D+0.7 · U.S. R+6.1 · modeled estimate
Runner-up · Alf Landon, 1936 · −23.6 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
The 11th Plymouth District backed the 2024 Democratic presidential nominee by nearly 54 points, placing it among the most reliably left-leaning legislative districts in a state already dominated by Democratic voters at the federal level.
Across the recorded series it reached a Democratic high of 79.2 points in 1964. Between 2020 and 2024 the district moved 11.9 points toward the Republican candidate; the 2024 margin was 54.2 points.
A population of 42,514, a 18% non-Hispanic-white share, and a median household income of $68,741 describe the district. The district's voting pattern over the last decade is most similar to that of 6th Suffolk District and 10th Plymouth District.
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 →
Massachusetts 121st State House District. Akashic. https://akashic.app/sld-lower/25121/. Accessed May 20, 2026. License: CC BY 4.0.