15840 is a Republican stronghold. About 22% of voters here vote Democratic and 78% Republican.
About 78% of adults in 15840 typically vote, above the U.S. average of about 62%. Among adults in 15840, ~17% vote Democratic, ~61% Republican, and ~22% don't vote. The map below shows estimated turnout by block group.
How 15840 compares
Among zip codes within 15 miles, 15840 leans more Republican than 5 of 15 neighbors.
15840 runs about 54 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by block within 15840. The northeast side is the most Republican-leaning (R+63) and the southeast side is the least Republican-leaning (R+46), a spread of about 17 points.
Why 15840 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 15840, not a ranked or complete list of what matters most.
Car-dependent areas vote Republican. About 84% of residents in 15840 drive to work alone, about 10 points above the U.S. average of 74%.
Foreign-born share and voter turnout
Places with a low foreign-born share tend to turn out in mixed patterns; 15840, PA sits in the bottom tenth nationally on this measure.
Why turnout in 15840 looks the way it does
Turnout in 15840 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.