01830 leans slightly Democratic by roughly 14 points: about 57% of voters vote Democratic and 43% Republican.
About 67% of adults in 01830 typically vote, near the U.S. average of about 62%. Among adults in 01830, ~38% vote Democratic, ~29% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.
How 01830 compares
Among zip codes within 15 miles, 01830 leans more Democratic than 29 of 44 neighbors.
01830 runs about 10 points more Republican than Massachusetts as a whole.
Politics vary noticeably by block within 01830. The southwest side runs the most Democratic (D+29) and the northeast side runs the most Republican (R+4), a spread of about 33 points.
Why 01830 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 01830, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 78% of residents in 01830 live in densely developed areas, about 41 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 36% of adults in 01830 have never been married, above 82% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 01830, MA sits in the top quarter nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.
Why turnout in 01830 looks the way it does
Turnout in 01830 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.