19129 is a Democratic stronghold. About 88% of voters here vote Democratic and 12% Republican.
About 75% of adults in 19129 typically vote, above the U.S. average of about 62%. Among adults in 19129, ~66% vote Democratic, ~9% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How 19129 compares
Among zip codes within 15 miles, 19129 leans more Democratic than 101 of 117 neighbors.
19129 runs about 79 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and 19129 sits clearly on the Democratic side.
Politics vary noticeably by block within 19129. The east side is the most Democratic-leaning (D+90) and the northwest side is the least Democratic-leaning (D+65), a spread of about 25 points.
Why 19129 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 19129, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 96% of residents in 19129 live in densely developed areas, about 60 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 19129 sits in the top quarter (about 59%, above 94% of zip codes). 19129 runs against the grain of Pennsylvania, a Democratic-leaning outlier in a roughly evenly split state.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 19129, PA sits in the top tenth nationally on this measure.
Why turnout in 19129 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 19129 is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 66%, about 6 points above the U.S. average of 60%. 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.