01118 leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 70% of adults in 01118 typically vote, above the U.S. average of about 62%. Among adults in 01118, ~43% vote Democratic, ~27% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How 01118 compares
Among zip codes within 15 miles, 01118 leans more Democratic than 21 of 36 neighbors.
Politically, 01118 sits close to the rest of Massachusetts.
Politics vary noticeably by block within 01118. The southwest side is the most Democratic-leaning (D+28) and the north side is the least Democratic-leaning (D+14), a spread of about 14 points.
Why 01118 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 01118, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 94% of residents in 01118 live in densely developed areas, about 58 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 42% of adults in 01118 have never been married, above 89% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 01118, MA sits in the top quarter nationally on this measure.
Why turnout in 01118 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 01118 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 68%, about 8 points above the U.S. average of 60%. 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.