07604 leans slightly Republican by roughly 10 points: about 45% of voters vote Democratic and 55% Republican.
About 70% of adults in 07604 typically vote, above the U.S. average of about 62%. Among adults in 07604, ~31% vote Democratic, ~39% Republican, and ~30% don't vote. The map below shows estimated turnout by block group.
How 07604 compares
Among zip codes within 15 miles, 07604 leans more Republican than 244 of 269 neighbors.
07604 runs about 15 points more Republican than New Jersey as a whole. New Jersey leans Democratic overall, while 07604 is one of the few Republican-leaning pockets.
Why 07604 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 07604, not a ranked or complete list of what matters most.
07604 votes Republican even though it is densely developed (more than 99%, far above the New Jersey average of 63%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 74% of households in 07604 are family households, above 76% of zip codes. 07604 runs against the grain of New Jersey, a Republican-leaning pocket in a Democratic-leaning state.
Walkability and Democratic lean
Places with a highly walkable street grid tend to lean Democratic; 07604, NJ 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 07604 looks the way it does
Areas with high high-school completion turn out at higher rates. About 96% of adults in 07604 have completed high school, about 6 points above the U.S. average of 90%. 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.