15004 leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.
About 66% of adults in 15004 typically vote, near the U.S. average of about 62%. Among adults in 15004, ~20% vote Democratic, ~45% Republican, and ~35% don't vote. The map below shows estimated turnout by block group.
How 15004 compares
Among zip codes within 15 miles, 15004 leans more Republican than 23 of 39 neighbors.
15004 runs about 36 points more Republican than Pennsylvania as a whole.
Why 15004 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 15004. The lean here lands roughly where demographic data alone would predict.
Foreign-born share and voter turnout
Places with a low foreign-born share tend to turn out in mixed patterns; 15004, PA sits in the bottom tenth nationally on this measure.
Why turnout in 15004 looks the way it does
Turnout in 15004 sits close to the national pattern. 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.