Brockton leans heavily Democratic by roughly 42 points: about 71% of voters vote Democratic and 29% Republican.
About 53% of adults in Brockton typically vote, below the U.S. average of about 62%. Among adults in Brockton, ~38% vote Democratic, ~15% Republican, and ~47% don't vote. The map below shows estimated turnout by block group.
How Brockton compares
Among cities within 25 miles, Brockton leans more Democratic than 114 of 146 neighbors.
Brockton runs about 17 points more Democratic than Massachusetts as a whole.
Politics vary noticeably by neighborhood within Brockton. The northwest side is the most Democratic-leaning (D+49) and the southwest side is the least Democratic-leaning (D+31), a spread of about 18 points.
Why Brockton leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Brockton, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 93% of residents in Brockton live in densely developed areas, about 56 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 43% of adults in Brockton have never been married, above 96% of cities.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; Brockton, MA sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in Brockton looks the way it does
Renters vote less often than owners. About 42% of households in Brockton rent, about 17 points above the U.S. average of 25%. High food insecurity lines up with lower turnout, and about 26% of adults in Brockton report food insecurity, above 92% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Avon, MA D+15
- West Bridgewater, MA R+8
- Abington, MA Even
- Whitman, MA R+4
- Holbrook, MA D+12
- North Easton, MA D+17
- Stoughton, MA D+23
- East Bridgewater, MA R+10
- South Easton, MA D+12
- Randolph, MA D+49
Cities with Similar Populations
- Menifee, CA R+14
- Missouri City, TX D+36
- Allen, TX R+5
- Sandy, UT D+4
- Frederick, MD D+27
- Fayetteville, AR D+17
- Roswell, GA D+7
- Georgetown, TX R+15
- Rio Rancho, NM R+4
- San Marcos, CA D+11
Sources and methodology
Precinct-level voting records used to fit the model come from Massachusetts Secretary of the Commonwealth, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.