19104 is a Democratic stronghold. About 89% of voters here vote Democratic and 11% Republican.
About 62% of adults in 19104 typically vote, near the U.S. average of about 62%. Among adults in 19104, ~55% vote Democratic, ~7% Republican, and ~38% don't vote. The map below shows estimated turnout by block group.
How 19104 compares
Among zip codes within 15 miles, 19104 leans more Democratic than 96 of 109 neighbors.
19104 runs about 79 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and 19104 sits clearly on the Democratic side.
Politics vary noticeably by block within 19104. The northwest side is the most Democratic-leaning (D+88) and the southeast side is the least Democratic-leaning (D+66), a spread of about 22 points.
Why 19104 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 19104, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 19104 live in densely developed areas, about 64 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and 19104 sits in the top quarter (about 57%, above 93% of zip codes). 19104 runs against the grain of Pennsylvania, a Democratic-leaning outlier in a roughly evenly split state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 19104, PA sits in the top tenth nationally on this measure. A walkable street grid does not change how people vote; it mostly reflects how urban a place is.
Why turnout in 19104 looks the way it does
Renters vote less often than owners. About 84% of households in 19104 rent, about 59 points above the U.S. average of 25%. Limited routine healthcare access lines up with lower turnout, and 19104 sits in the bottom quarter on routine-care measures. High-crime urban areas turn out at lower rates, and 19104 sits in the top 15% on a violent-crime measure. 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.