02140 is a Democratic stronghold. About 87% of voters here vote Democratic and 13% Republican.
About 61% of adults in 02140 typically vote, near the U.S. average of about 62%. Among adults in 02140, ~53% vote Democratic, ~8% Republican, and ~39% don't vote. The map below shows estimated turnout by block group.
How 02140 compares
Among zip codes within 15 miles, 02140 leans more Democratic than 103 of 107 neighbors.
02140 runs about 49 points more Democratic than Massachusetts as a whole.
Politics vary noticeably by block within 02140. The east side is the most Democratic-leaning (D+79) and the west side is the least Democratic-leaning (D+66), a spread of about 13 points.
Why 02140 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 02140, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 77% of adults in 02140 hold a bachelor's degree, about 48 points above the U.S. average of 28%. Dense areas vote Democratic, and 02140 sits in the top fifth on density (about 98%, above 94% of zip codes). A high never-married share predicts Democratic voting, and about 49% of adults in 02140 have never been married, above 94% of zip codes.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 02140, MA sits in the top tenth 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 02140 looks the way it does
Renters vote less often than owners. About 64% of households in 02140 rent, about 39 points above the U.S. average of 25%. Strong routine healthcare access lines up with higher turnout, and 02140 sits in the top quarter on routine-care measures. Crowded housing lines up with lower turnout, and about 4% of homes in 02140 have more than one occupant per room, above 82% 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.