15663 leans heavily Republican by roughly 48 points: about 26% of voters vote Democratic and 74% Republican.
About 85% of adults in 15663 typically vote, above the U.S. average of about 62%. Among adults in 15663, ~22% vote Democratic, ~63% Republican, and ~15% don't vote. The map below shows estimated turnout by block group.
How 15663 compares
Among zip codes within 15 miles, 15663 leans more Republican than 81 of 88 neighbors.
15663 runs about 47 points more Republican than Pennsylvania as a whole.
Why 15663 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 15663, not a ranked or complete list of what matters most.
Areas with a high white share and below-average college attainment vote Republican. In 15663, more than 99% of residents are non-Hispanic white, about 27 points above the U.S. average of 72%; about 13% of adults hold a bachelor's degree, about 13 points below the Pennsylvania average of 26%. Car-dependent areas vote Republican, and about 91% of residents in 15663 drive to work alone, above 97% of zip codes.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; 15663, PA sits in the top quarter nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in 15663 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 15663 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 66%, about 6 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 96% of adults in 15663 have completed high school, above 84% 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.