15215 leans Democratic by roughly 28 points: about 64% of voters vote Democratic and 36% Republican.
About 92% of adults in 15215 typically vote, above the U.S. average of about 62%. Among adults in 15215, ~59% vote Democratic, ~33% Republican, and ~8% don't vote. The map below shows estimated turnout by block group.
How 15215 compares
Among zip codes within 15 miles, 15215 leans more Democratic than 65 of 92 neighbors.
15215 runs about 30 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and 15215 sits clearly on the Democratic side.
Politics vary noticeably by block within 15215. The south side is the most Democratic-leaning (D+43) and the northwest side is the least Democratic-leaning (D+13), a spread of about 30 points.
Why 15215 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 15215, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 60% of adults in 15215 hold a bachelor's degree, about 32 points above the U.S. average of 28%. Dense areas vote Democratic, and 15215 sits in the top fifth on density (about 80%, above 83% of zip codes). 15215 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; 15215, 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 15215 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 15215 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 71%, about 11 points above the U.S. average of 60%. 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.