Massachusetts Political Map | Democrat & Republican Areas in Massachusetts

By the BestNeighborhood data science team. Last updated May 2026.

Massachusetts leans Democratic by roughly 26 points: about 63% of voters vote Democratic and 37% Republican.

 

About 71% of adults in Massachusetts typically vote, above the U.S. average of about 62%. Among adults in Massachusetts, ~45% vote Democratic, ~26% Republican, and ~29% don't vote. The map below shows estimated turnout by block group.

How Massachusetts compares

Among states within 500 miles, Massachusetts leans more Democratic than 9 of 11 neighbors.

Politics vary noticeably by county within Massachusetts. The east side is the most Democratic-leaning (D+34) and the south side is the least Democratic-leaning (D+7), a spread of about 26 points.

Why Massachusetts leans the way it does

This analysis examined 14,881 data points per state to find what predicts political lean and turnout. The items below are a few correlations that stood out for Massachusetts, not a ranked or complete list of what matters most.

Areas with high college attainment vote Democratic. About 47% of adults in Massachusetts hold a bachelor's degree, about 19 points above the U.S. average of 28%. A high never-married share predicts Democratic voting, and about 37% of adults in Massachusetts have never been married, above 92% of states.

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; Massachusetts sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in Massachusetts looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Massachusetts is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 70%, about 10 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.

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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.