15229 leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.
About 88% of adults in 15229 typically vote, above the U.S. average of about 62%. Among adults in 15229, ~48% vote Democratic, ~40% Republican, and ~12% don't vote. The map below shows estimated turnout by block group.
How 15229 compares
Among zip codes within 15 miles, 15229 leans more Democratic than 47 of 89 neighbors.
15229 runs about 12 points more Democratic than Pennsylvania as a whole.
Politics vary noticeably by block within 15229. The southwest side is the most Democratic-leaning (D+17) and the southeast side is the least Democratic-leaning (D+4), a spread of about 12 points.
Why 15229 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 15229, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 84% of residents in 15229 live in densely developed areas, about 48 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 15229 sits in the top quarter (about 47%, above 87% of zip codes).
Population density and Democratic lean
Places with high population density tend to lean Democratic; 15229, PA sits in the top quarter nationally on this measure.
Why turnout in 15229 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 15229 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 68%, about 8 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in 15229 have completed high school, above 83% 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.