01105 leans heavily Democratic by roughly 44 points: about 72% of voters vote Democratic and 28% Republican.
About 33% of adults in 01105 typically vote, below the U.S. average of about 62%. Among adults in 01105, ~24% vote Democratic, ~9% Republican, and ~67% don't vote. The map below shows estimated turnout by block group.
How 01105 compares
Among zip codes within 15 miles, 01105 leans more Democratic than 36 of 38 neighbors.
01105 runs about 19 points more Democratic than Massachusetts as a whole.
Politics vary noticeably by block within 01105. The northeast side is the most Democratic-leaning (D+49) and the south side is the least Democratic-leaning (D+33), a spread of about 16 points.
Why 01105 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 01105, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 97% of residents in 01105 live in densely developed areas, about 61 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 62% of adults in 01105 have never been married, above 98% of zip codes.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 01105, MA sits in the bottom 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 01105 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 01105 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 42%, about 30 points below the Massachusetts average of 72%. Renters vote less often than owners, and about 83% of households in 01105 rent, compared to around 46% in nearby zip codes. High food insecurity lines up with lower turnout, and about 51% of adults in 01105 report food insecurity, in the top fraction of zip codes. 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.