15148 leans Democratic by roughly 28 points: about 64% of voters vote Democratic and 36% Republican.
About 58% of adults in 15148 typically vote, near the U.S. average of about 62%. Among adults in 15148, ~37% vote Democratic, ~21% Republican, and ~42% don't vote. The map below shows estimated turnout by block group.
How 15148 compares
Among zip codes within 15 miles, 15148 leans more Democratic than 73 of 101 neighbors.
15148 runs about 29 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and 15148 sits clearly on the Democratic side.
Politics vary noticeably by block within 15148. The northeast side runs the most Democratic (D+45) and the southeast side runs the most Republican (R+3), a spread of about 49 points.
Why 15148 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 15148, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 75% of residents in 15148 live in densely developed areas, about 38 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 55% of adults in 15148 have never been married, above 97% of zip codes. 15148 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; 15148, 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 15148 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 15148 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 59% of households in 15148 rent, compared to around 42% in nearby 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.