Brookline leans Democratic by roughly 24 points: about 62% of voters vote Democratic and 38% Republican.
About 77% of adults in Brookline typically vote, above the U.S. average of about 62%. Among adults in Brookline, ~48% vote Democratic, ~29% Republican, and ~23% don't vote. The map below shows estimated turnout by block group.
How Brookline compares
Among neighborhoods within 5 miles, Brookline leans more Democratic than 5 of 22 neighbors.
Brookline runs about 25 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and Brookline sits clearly on the Democratic side.
Politics vary noticeably by block within Brookline. The northwest side is the most Democratic-leaning (D+34) and the northeast side is the least Democratic-leaning (D+16), a spread of about 18 points.
Why Brookline 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 Brookline, not a ranked or complete list of what matters most.
Brookline votes against the grain of Pennsylvania. Pennsylvania is roughly evenly split, while Brookline runs about 25 points more Democratic.
Park access and Democratic lean
Places with heavy park coverage tend to lean Democratic; Brookline, Pittsburgh, PA sits in the top quarter nationally on this measure. Park access does not change how people vote; it tends to track denser, higher-income areas.
Why turnout in Brookline looks the way it does
Turnout in Brookline 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 Neighborhoods
- Beechview, Pittsburgh, PA D+34
- Overbrook, Pittsburgh, PA D+4
- Sunset Hills, Pittsburgh, PA D+34
- Banksville, Pittsburgh, PA D+20
- Knoxville, Pittsburgh, PA D+59
- Carrick, Pittsburgh, PA D+18
- Mission Hills, Pittsburgh, PA D+37
- Mount Washington, Pittsburgh, PA D+40
- whitehall, Pittsburgh, PA D+8
- Southside Slopes, Pittsburgh, PA D+42
Neighborhoods with Similar Populations
- Bailey's Crossroads, Falls Church, VA D+44
- Hidden Valley, Charlotte, NC D+68
- Southeast, Eugene, OR D+63
- Downtown Yonkers, Yonkers, NY D+48
- Berkeley Hills, Berkeley, CA D+83
- Cultural Corridor, Las Vegas, NV D+34
- Savage-Guilford, Laurel, MD D+52
- South Englewood, Chicago, IL D+83
- South Park, Los Angeles, CA D+58
- Valley Station, Louisville, KY R+15
Sources and methodology
Precinct-level voting records used to fit the model come from Pennsylvania Department of State, Bureau of 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.