18355 leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 88% of adults in 18355 typically vote, above the U.S. average of about 62%. Among adults in 18355, ~40% vote Democratic, ~48% Republican, and ~12% don't vote. The map below shows estimated turnout by block group.
How 18355 compares
Among zip codes within 15 miles, 18355 leans more Republican than 12 of 36 neighbors.
18355 runs about 8 points more Republican than Pennsylvania as a whole.
Politics vary noticeably by block within 18355. The northwest side runs the most Democratic (D+3) and the south side runs the most Republican (R+17), a spread of about 20 points.
Why 18355 leans the way it does
Density, race composition, education, and family structure all sit close to their national averages in 18355. The lean here lands roughly where demographic data alone would predict.
High-school completion and voter turnout
Places with high-school-completion-heavy adults tend to turn out at a higher rate; 18355, PA sits in the top quarter nationally on this measure.
Why turnout in 18355 looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in 18355 have completed high school, about 6 points above the U.S. average of 90%. 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.