19004 leans heavily Democratic by roughly 44 points: about 72% of voters vote Democratic and 28% Republican.
About 99% of adults in 19004 typically vote, above the U.S. average of about 62%. Among adults in 19004, ~71% vote Democratic, ~28% Republican, and ~1% don't vote. The map below shows estimated turnout by block group.
How 19004 compares
Among zip codes within 15 miles, 19004 leans more Democratic than 70 of 118 neighbors.
19004 runs about 46 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and 19004 sits clearly on the Democratic side.
Why 19004 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 19004, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 77% of adults in 19004 hold a bachelor's degree, about 48 points above the U.S. average of 28%. Dense areas vote Democratic, and 19004 sits in the top fifth on density (about 99%, above 95% of zip codes). 19004 runs against the grain of Pennsylvania, a Democratic-leaning outlier in a roughly evenly split state.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; 19004, PA sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in 19004 looks the way it does
Areas with strong routine healthcare access turn out at higher rates. 19004 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 76%, about 16 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in 19004 have completed high school, above 94% 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.