15146 leans Democratic by roughly 20 points: about 60% of voters vote Democratic and 40% Republican.
About 84% of adults in 15146 typically vote, above the U.S. average of about 62%. Among adults in 15146, ~50% vote Democratic, ~34% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 15146 compares
Among zip codes within 15 miles, 15146 leans more Democratic than 64 of 95 neighbors.
15146 runs about 22 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and 15146 sits clearly on the Democratic side.
Politics vary noticeably by block within 15146. The northwest side is the most Democratic-leaning (D+32) and the northeast side is the least Democratic-leaning (D+6), a spread of about 26 points.
Why 15146 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 15146, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 46% of adults in 15146 hold a bachelor's degree, about 18 points above the U.S. average of 28%. Density combined with diversity predicts Democratic voting, and non-Hispanic white share in 15146 is about 70%, below 68% of zip codes. 15146 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; 15146, PA sits in the top quarter 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 15146 looks the way it does
Areas with high high-school completion turn out at higher rates. About 97% of adults in 15146 have completed high school, about 6 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.