17078 leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 87% of adults in 17078 typically vote, above the U.S. average of about 62%. Among adults in 17078, ~35% vote Democratic, ~52% Republican, and ~13% don't vote. The map below shows estimated turnout by block group.
How 17078 compares
Among zip codes within 15 miles, 17078 leans more Republican than 12 of 27 neighbors.
17078 runs about 19 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by block within 17078. The northwest side is the most Republican-leaning (R+26) and the southwest side is the least Republican-leaning (R+12), a spread of about 15 points.
Why 17078 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 17078, not a ranked or complete list of what matters most.
17078 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.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 17078, 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 17078 looks the way it does
Turnout in 17078 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.