17603 leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 70% of adults in 17603 typically vote, above the U.S. average of about 62%. Among adults in 17603, ~43% vote Democratic, ~27% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How 17603 compares
Among zip codes within 15 miles, 17603 is the most Democratic-leaning.
17603 runs about 23 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and 17603 sits clearly on the Democratic side.
Politics vary noticeably by block within 17603. The northeast side runs the most Democratic (D+50) and the southwest side runs the most Republican (R+16), a spread of about 66 points.
Why 17603 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 17603, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 85% of residents in 17603 live in densely developed areas, about 49 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 17603 sits in the top quarter (about 37%, above 77% of zip codes). A high never-married share predicts Democratic voting, and about 38% of adults in 17603 have never been married, above 85% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 17603, PA sits in the top tenth nationally on this measure.
Why turnout in 17603 looks the way it does
Turnout in 17603 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.