15821 is a Republican stronghold. About 24% of voters here vote Democratic and 76% Republican.
About 84% of adults in 15821 typically vote, above the U.S. average of about 62%. Among adults in 15821, ~20% vote Democratic, ~64% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How 15821 compares
Among zip codes within 15 miles, 15821 leans more Republican than 7 of 10 neighbors.
15821 runs about 51 points more Republican than Pennsylvania as a whole.
Why 15821 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 15821, not a ranked or complete list of what matters most.
Rural areas vote Republican. About 2% of residents in 15821 live in densely developed areas, about 31 points below the Pennsylvania average of 33%. A high white share with below-average college attainment predicts Republican voting, and 15821 fits that profile on both counts.
Developed land and Republican lean
Places with a rural land-use pattern tend to lean Republican; 15821, PA sits in the bottom tenth nationally on this measure. Developed land does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 15821 looks the way it does
Homeowners vote more often than renters. About 89% of households in 15821 own their home, about 10 points above the Pennsylvania average of 79%. 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.