18237 leans heavily Republican by roughly 36 points: about 32% of voters vote Democratic and 68% Republican.
About 51% of adults in 18237 typically vote, below the U.S. average of about 62%. Among adults in 18237, ~16% vote Democratic, ~35% Republican, and ~49% don't vote. The map below shows estimated turnout by block group.
How 18237 compares
Among zip codes within 15 miles, 18237 leans more Republican than 17 of 48 neighbors.
18237 runs about 35 points more Republican than Pennsylvania as a whole.
Why 18237 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 18237, not a ranked or complete list of what matters most.
18237 votes Republican even though it is densely developed (about 76%, far above the Pennsylvania average of 33%). State and regional patterns outweigh the Democratic lean that density usually predicts here. Low college attainment predicts Republican voting, and 18237 sits in the bottom quarter (about 14%, below 85% of zip codes).
High-school completion, developed land, and voter turnout
Places that combine low high-school-completion share and a heavily developed built environment tend to turn out at a lower rate, as 18237, PA does.
Why turnout in 18237 looks the way it does
Renters vote less often than owners. About 37% of households in 18237 rent, about 12 points above the U.S. average of 25%. Low high-school completion lines up with lower turnout, and about 85% of adults in 18237 have completed high school, below 81% 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.