16621 is a Republican stronghold. About 17% of voters here vote Democratic and 83% Republican.
About 68% of adults in 16621 typically vote, above the U.S. average of about 62%. Among adults in 16621, ~12% vote Democratic, ~57% Republican, and ~31% don't vote. The map below shows estimated turnout by block group.
How 16621 compares
Among zip codes within 15 miles, 16621 leans more Republican than 8 of 29 neighbors.
16621 runs about 64 points more Republican than Pennsylvania as a whole.
Why 16621 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 16621, not a ranked or complete list of what matters most.
Areas with low college attainment vote Republican. About 11% of adults in 16621 hold a bachelor's degree, about 14 points below the Pennsylvania average of 26%. Rural areas vote Republican, and 16621 sits in the bottom quarter on density (about 6%, below 78% of zip codes).
Population density and Republican lean
Places with low population density tend to lean Republican; 16621, PA sits below the national average on this measure.
Why turnout in 16621 looks the way it does
Homeowners vote more often than renters. About 89% of households in 16621 own their home, about 9 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.