15225 leans slightly Republican by roughly 6 points: about 47% of voters vote Democratic and 53% Republican.
About 69% of adults in 15225 typically vote, above the U.S. average of about 62%. Among adults in 15225, ~32% vote Democratic, ~37% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How 15225 compares
Among zip codes within 15 miles, 15225 leans more Republican than 55 of 77 neighbors.
15225 runs about 4 points more Republican than Pennsylvania as a whole.
Why 15225 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 15225, not a ranked or complete list of what matters most.
15225 votes Republican even though it is densely developed (about 68%, far above the Pennsylvania average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 15225, 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 15225 looks the way it does
Areas with high high-school completion turn out at higher rates. About 98% of adults in 15225 have completed high school, about 7 points above the Pennsylvania average of 91%. 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.