Belleville, NJ Political Map | Democrat & Republican Areas in Belleville

By the BestNeighborhood data science team. Last updated May 2026.

Belleville leans slightly Democratic by roughly 10 points: about 55% of voters vote Democratic and 45% Republican.

 

About 53% of adults in Belleville typically vote, below the U.S. average of about 62%. Among adults in Belleville, ~29% vote Democratic, ~24% Republican, and ~47% don't vote. The map below shows estimated turnout by block group.

How Belleville compares

Among cities within 25 miles, Belleville leans more Democratic than 175 of 289 neighbors.

Belleville runs about 4 points more Democratic than New Jersey as a whole.

Politics vary noticeably by neighborhood within Belleville. The southwest side is the most Democratic-leaning (D+22) and the north side is the least Democratic-leaning (Even), a spread of about 21 points.

Why Belleville leans the way it does

This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Belleville, not a ranked or complete list of what matters most.

Dense areas vote Democratic. More than 99% of residents in Belleville live in densely developed areas, about 63 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Belleville sits in the top quarter (about 34%, above 80% of cities). A high never-married share predicts Democratic voting, and about 36% of adults in Belleville have never been married, above 89% of cities.

Walkability and Democratic lean

Places with a highly walkable street grid tend to lean Democratic; Belleville, 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 Belleville looks the way it does

Areas with limited routine healthcare access turn out at lower rates. Belleville is in the bottom quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. Renters vote less often than owners, and about 44% of households in Belleville rent, about 19 points above the U.S. average of 25%. Crowded housing lines up with lower turnout, and about 6% of homes in Belleville have more than one occupant per room, above 90% of cities. Learn more about the findings and methodology on the political spectrum map.

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.