01840 leans Democratic by roughly 24 points: about 62% of voters vote Democratic and 38% Republican.
About 35% of adults in 01840 typically vote, below the U.S. average of about 62%. Among adults in 01840, ~21% vote Democratic, ~13% Republican, and ~66% don't vote. The map below shows estimated turnout by block group.
How 01840 compares
Among zip codes within 15 miles, 01840 leans more Democratic than 40 of 45 neighbors.
Politically, 01840 sits close to the rest of Massachusetts.
Politics vary noticeably by block within 01840. The east side is the most Democratic-leaning (D+32) and the northwest side is the least Democratic-leaning (D+11), a spread of about 21 points.
Why 01840 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 01840, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 97% of residents in 01840 live in densely developed areas, about 60 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 45% of adults in 01840 have never been married, above 92% of zip codes.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 01840, MA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 01840 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 01840 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The uninsured rate here is about 21%, about 17 points above the Massachusetts average of 5%. Renters vote less often than owners, and about 97% of households in 01840 rent, compared to around 34% in nearby zip codes. High food insecurity lines up with lower turnout, and about 41% of adults in 01840 report food insecurity, above 98% 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.