Back Bay is a Democratic stronghold. About 81% of voters here vote Democratic and 19% Republican.
About 60% of adults in Back Bay typically vote, near the U.S. average of about 62%. Among adults in Back Bay, ~49% vote Democratic, ~11% Republican, and ~40% don't vote. The map below shows estimated turnout by block group.
How Back Bay compares
Among neighborhoods within 5 miles, Back Bay leans more Democratic than 17 of 50 neighbors.
Back Bay runs about 37 points more Democratic than Massachusetts as a whole.
Politics vary noticeably by block within Back Bay. The northeast side is the most Democratic-leaning (D+65) and the northwest side is the least Democratic-leaning (D+14), a spread of about 52 points.
Why Back Bay leans the way it does
This analysis examined 14,881 data points per neighborhood to find what predicts political lean and turnout. The items below are a few correlations that stood out for Back Bay, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 85% of adults in Back Bay hold a bachelor's degree, about 56 points above the U.S. average of 28%. A high never-married share predicts Democratic voting, and about 57% of adults in Back Bay have never been married, above 90% of neighborhoods.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Back Bay, Boston, 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 Back Bay looks the way it does
Renters vote less often than owners. About 68% of households in Back Bay rent, about 43 points above the U.S. average of 25%. Strong routine healthcare access lines up with higher turnout, and Back Bay sits in the top quarter on routine-care measures. Learn more about the findings and methodology on the political spectrum map.
Nearby Neighborhoods
- South End, Boston, MA D+64
- Central, Boston, MA D+53
- Downtown Crossing, Boston, MA D+61
- MIT, Cambridge, MA D+70
- Fenway-Kenmore, Boston, MA D+67
- East Cambridge, Cambridge, MA D+65
- Area IV, Cambridge, MA D+74
- Dock Square, Boston, MA D+53
- Wellington-Harrington, Cambridge, MA D+72
- Cambridgeport, Cambridge, MA D+77
Neighborhoods with Similar Populations
- Logan-Ogontz-Fern Rock, Philadelphia, PA D+85
- Cooper Mountain-Aloha North, Aloha, OR D+29
- College Area, San Diego, CA D+41
- Clifton, Staten Island, NY D+33
- Highland, St. Paul, MN D+60
- UC Irvine, Irvine, CA D+70
- Springfield Gardens, Queens, NY D+78
- Northwest Austin, Austin, TX D+25
- Shadow Creek Ranch, Pearland, TX D+33
- Green Hills, Nashville, TN D+13
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.