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Massachusetts's 3rd Congressional District
The current officeholder, the 2024 result, and a precinct-level model you can run yourself — built from how Massachusetts actually voted.
Model Massachusetts's 3rd Congressional District →
Current officeholder
Lori Trahan Democratic
2024 result
Democratic D+100.0
2024 votes cast
264,698
Office
U.S. House
Who lives in this district
This district is home to about 777,948 people, median age 39.2, median household income $97,616.
Population
777,948
Median age
39.2
Median household income
$97,616
Bachelor's degree or higher
39.6%
Race & ethnicity: White 61.1% · Black 4.6% · Hispanic 22.2% · Asian 7.9%
Source: U.S. Census Bureau, 2019–2023 American Community Survey (5-year).
Precinct results — 2024 general
254 precincts reported in Massachusetts's 3rd Congressional District's 2024 general election. The twenty largest:
| Precinct | Winner | Margin | Votes |
|---|---|---|---|
| 25027-HARVARD_ward0_precinct1 | Democratic | D+97.4 | 3,224 |
| 25027-BOLTON_ward0_precinct1 | Democratic | D+96.6 | 2,882 |
| 25017-CARLISLE_ward0_precinct1 | Democratic | D+98.1 | 2,753 |
| 25017-SHIRLEY_ward0_precinct1 | Democratic | D+96.4 | 2,719 |
| 25017-BOXBOROUGH_ward0_precinct1 | Democratic | D+100.0 | 2,528 |
| 25017-CONCORD_ward0_precinct4 | Democratic | D+99.3 | 2,205 |
| 25017-CONCORD_ward0_precinct2 | Democratic | D+99.1 | 2,069 |
| 25017-CONCORD_ward0_precinct3 | Democratic | D+98.9 | 2,019 |
| 25017-GROTON_ward0_precinct1 | Democratic | D+99.2 | 2,003 |
| 25017-CONCORD_ward0_precinct5 | Democratic | D+99.2 | 1,954 |
| 25017-STOW_ward0_precinct1 | Democratic | D+98.6 | 1,925 |
| 25017-WESTFORD_ward0_precinct7 | Democratic | D+97.9 | 1,878 |
| 25017-ACTON_ward0_precinct3 | Democratic | D+97.7 | 1,871 |
| 25017-STOW_ward0_precinct2 | Democratic | D+98.8 | 1,816 |
| 25017-WESTFORD_ward0_precinct3 | Democratic | D+97.6 | 1,816 |
| 25017-GROTON_ward0_precinct2 | Democratic | D+98.7 | 1,804 |
| 25017-GROTON_ward0_precinct3 | Democratic | D+98.3 | 1,803 |
| 25017-WESTFORD_ward0_precinct6 | Democratic | D+97.0 | 1,775 |
| 25027-BERLIN_ward0_precinct1 | Democratic | D+98.7 | 1,764 |
| 25017-CONCORD_ward0_precinct1 | Democratic | D+99.0 | 1,726 |
All 254 precincts are modelable — open the race in the simulator and drill to precinct grain.
Find your district
Enter a ZIP code or a district (e.g. NC-4) to find your U.S. House district and who represents it.
Model Massachusetts's 3rd Congressional District in five steps
- Set the candidates. Name the contenders for the Massachusetts's 3rd Congressional District (or keep the generic Democrat / Republican defaults). The map starts from the canonical mixed-grain 2024 presidential baseline.
- Apply a swing. Move vote share statewide, or by demographic cohort, with a slider. The map and the running tally recompute instantly.
- Model turnout. Mobilize or depress turnout for any group — turnout and persuasion are modeled separately, the way a real campaign thinks about them.
- Explore local geography. Zoom from the state through counties to the finest supported reporting grain and adjust the places available in the model.
- Roll up & share. Roll the result up to chamber control, then share the exact versioned scenario.
Open Massachusetts's 3rd Congressional District in the simulator →