08104 is a Democratic stronghold. About 87% of voters here vote Democratic and 13% Republican.
About 43% of adults in 08104 typically vote, below the U.S. average of about 62%. Among adults in 08104, ~38% vote Democratic, ~5% Republican, and ~57% don't vote. The map below shows estimated turnout by block group.
How 08104 compares
Among zip codes within 15 miles, 08104 leans more Democratic than 123 of 148 neighbors.
08104 runs about 68 points more Democratic than New Jersey as a whole.
Why 08104 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 08104, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 95% of residents in 08104 live in densely developed areas, about 59 points above the U.S. average of 36%. A high never-married share predicts Democratic voting, and about 60% of adults in 08104 have never been married, above 98% of zip codes.
Population density and Democratic lean
Places with high population density tend to lean Democratic; 08104, NJ sits in the top tenth nationally on this measure.
Why turnout in 08104 looks the way it does
Areas with limited routine healthcare access turn out at lower rates. 08104 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 40%, about 28 points below the New Jersey average of 68%. Renters vote less often than owners, and about 66% of households in 08104 rent, compared to around 44% in nearby zip codes. High food insecurity lines up with lower turnout, and about 44% of adults in 08104 report food insecurity, in the top fraction 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 New Jersey Division 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.