01731 leans heavily Democratic by roughly 42 points: about 71% of voters vote Democratic and 29% Republican.
About 62% of adults in 01731 typically vote, near the U.S. average of about 62%. Among adults in 01731, ~44% vote Democratic, ~18% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How 01731 compares
Among zip codes within 15 miles, 01731 leans more Democratic than 42 of 103 neighbors.
01731 runs about 17 points more Democratic than Massachusetts as a whole.
Politics vary noticeably by block within 01731. The east side is the most Democratic-leaning (D+51) and the northeast side is the least Democratic-leaning (D+26), a spread of about 25 points.
Why 01731 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 01731, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 97% of residents in 01731 live in densely developed areas, about 60 points above the U.S. average of 36%.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 01731, MA sits in the top quarter nationally on this measure.
Why turnout in 01731 looks the way it does
Renters vote less often than owners. More than 99% of households in 01731 rent, about 74 points above the U.S. average of 25%. Strong routine healthcare access lines up with higher turnout, and 01731 sits in the top quarter on routine-care measures. 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.