Bryn Mawr leans heavily Democratic by roughly 40 points: about 70% of voters vote Democratic and 30% Republican.
About 84% of adults in Bryn Mawr typically vote, above the U.S. average of about 62%. Among adults in Bryn Mawr, ~59% vote Democratic, ~25% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How Bryn Mawr compares
Among cities within 25 miles, Bryn Mawr leans more Democratic than 221 of 253 neighbors.
Bryn Mawr runs about 42 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and Bryn Mawr sits clearly on the Democratic side.
Politics vary noticeably by neighborhood within Bryn Mawr. The east side is the most Democratic-leaning (D+61) and the southwest side is the least Democratic-leaning (D+24), a spread of about 37 points.
Why Bryn Mawr leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Bryn Mawr, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 75% of adults in Bryn Mawr hold a bachelor's degree, about 46 points above the U.S. average of 28%. Dense areas vote Democratic, and Bryn Mawr sits in the top fifth on density (about 90%, above 96% of cities). Bryn Mawr runs against the grain of Pennsylvania, a Democratic-leaning outlier in a roughly evenly split state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; Bryn Mawr, PA 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 Bryn Mawr looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Bryn Mawr is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Bryn Mawr have completed high school, above 91% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Haverford, PA D+50
- Villanova, PA D+27
- Ardmore, PA D+53
- Gladwyne, PA D+32
- West Conshohocken, PA D+26
- Havertown, PA D+22
- Wynnewood, PA D+61
- Narberth, PA D+54
- Broomall, PA R+6
- Wayne, PA D+31
Cities with Similar Populations
- Canyon Lake, TX R+48
- Howard, WI R+12
- Fulshear, TX R+25
- Watervliet, NY D+17
- Fort Payne, AL R+63
- The Dalles, OR R+10
- Mattoon, IL R+33
- Evergreen Park, IL D+31
- Lackawanna, NY D+3
- Forest Lake, MN R+7
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.