15143 leans slightly Democratic by roughly 8 points: about 54% of voters vote Democratic and 46% Republican.
About 93% of adults in 15143 typically vote, above the U.S. average of about 62%. Among adults in 15143, ~50% vote Democratic, ~43% Republican, and ~7% don't vote. The map below shows estimated turnout by block group.
How 15143 compares
Among zip codes within 15 miles, 15143 leans more Democratic than 39 of 69 neighbors.
15143 runs about 10 points more Democratic than Pennsylvania as a whole.
Politics vary noticeably by block within 15143. The southwest side runs the most Democratic (D+32) and the north side runs the most Republican (R+10), a spread of about 43 points.
Why 15143 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 15143, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 63% of adults in 15143 hold a bachelor's degree, about 35 points above the U.S. average of 28%.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 15143, 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 15143 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 15143 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 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in 15143 have completed high school, above 89% 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.