01331 leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 72% of adults in 01331 typically vote, above the U.S. average of about 62%. Among adults in 01331, ~32% vote Democratic, ~40% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 01331 compares
Among zip codes within 15 miles, 01331 leans more Republican than 12 of 20 neighbors.
01331 runs about 35 points more Republican than Massachusetts as a whole. Massachusetts leans Democratic overall, while 01331 is one of the few Republican-leaning pockets.
Politics vary noticeably by block within 01331. The southeast side is the most Republican-leaning (R+20) and the northwest side is the least Republican-leaning (R+7), a spread of about 14 points.
Why 01331 leans the way it does
This analysis examined 14,881 data points per zip code to find what predicts political lean and turnout. The items below are a few correlations that stood out for 01331, not a ranked or complete list of what matters most.
01331 votes against the grain of Massachusetts. Massachusetts leans Democratic overall, while 01331 runs about 35 points more Republican.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 01331, MA sits above the national average 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 01331 looks the way it does
Turnout in 01331 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Zip Codes
Zip Codes with Similar Populations
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.