15639 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 83% of adults in 15639 typically vote, above the U.S. average of about 62%. Among adults in 15639, ~27% vote Democratic, ~56% Republican, and ~17% don't vote. The map below shows estimated turnout by block group.
How 15639 compares
Among zip codes within 15 miles, 15639 leans more Republican than 32 of 71 neighbors.
15639 runs about 35 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by block within 15639. The east side is the most Republican-leaning (R+46) and the west side is the least Republican-leaning (R+34), a spread of about 12 points.
Why 15639 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 15639. The lean here lands roughly where demographic data alone would predict.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 15639, PA sits above the national average on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 15639 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 15639 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 67%, about 7 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in 15639 have completed high school, above 92% 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.