15401 leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 72% of adults in 15401 typically vote, above the U.S. average of about 62%. Among adults in 15401, ~29% vote Democratic, ~43% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.
How 15401 compares
Among zip codes within 15 miles, 15401 leans more Republican than 1 of 57 neighbors.
15401 runs about 18 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by block within 15401. The east side runs the most Democratic (D+11) and the northwest side runs the most Republican (R+37), a spread of about 48 points.
Why 15401 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 15401, not a ranked or complete list of what matters most.
15401 votes Republican even though it is densely developed (about 67%, far above the Pennsylvania average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 15401, PA sits in the top quarter nationally on this measure.
Why turnout in 15401 looks the way it does
Turnout in 15401 sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. 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.