15211 leans heavily Democratic by roughly 38 points: about 69% of voters vote Democratic and 31% Republican.
About 79% of adults in 15211 typically vote, above the U.S. average of about 62%. Among adults in 15211, ~55% vote Democratic, ~24% Republican, and ~21% don't vote. The map below shows estimated turnout by block group.
How 15211 compares
Among zip codes within 15 miles, 15211 leans more Democratic than 80 of 100 neighbors.
15211 runs about 40 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and 15211 sits clearly on the Democratic side.
Why 15211 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 15211, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 88% of residents in 15211 live in densely developed areas, about 52 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 15211 sits in the top quarter (about 57%, above 93% of zip codes). 15211 runs against the grain of Pennsylvania, a Democratic-leaning outlier in a roughly evenly split state.
Paved land cover and Democratic lean
Places with extensive paved surfaces tend to lean Democratic; 15211, PA 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 15211 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 15211 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 65%, above 65% of zip codes. High high-school completion lines up with higher turnout, and about 97% of adults in 15211 have completed high school, above 91% 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 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.