18101 leans heavily Democratic by roughly 40 points: about 70% of voters vote Democratic and 30% Republican.
About 46% of adults in 18101 typically vote, below the U.S. average of about 62%. Among adults in 18101, ~32% vote Democratic, ~14% Republican, and ~54% don't vote. The map below shows estimated turnout by block group.
How 18101 compares
Among zip codes within 15 miles, 18101 is the most Democratic-leaning.
18101 runs about 41 points more Democratic than Pennsylvania as a whole. Pennsylvania is roughly evenly split, and 18101 sits clearly on the Democratic side.
Why 18101 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 18101, not a ranked or complete list of what matters most.
Dense areas vote Democratic. More than 99% of residents in 18101 live in densely developed areas, about 63 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 59% of adults in 18101 have never been married, above 98% of zip codes. 18101 runs against the grain of Pennsylvania, a Democratic-leaning outlier in a roughly evenly split state.
Preventive-care access and voter turnout
Places with limited routine preventive-care access tend to turn out at a lower rate; 18101, PA sits in the bottom 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 18101 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 18101 is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 46%, about 17 points below the Pennsylvania average of 64%. Renters vote less often than owners, and about 88% of households in 18101 rent, compared to around 37% in nearby zip codes. High-crime urban areas turn out at lower rates, and 18101 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.