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

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

Seaville leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.

 

About 91% of adults in Seaville typically vote, above the U.S. average of about 62%. Among adults in Seaville, ~34% vote Democratic, ~57% Republican, and ~9% don't vote. The map below shows estimated turnout by block group.

How Seaville compares

Among cities within 25 miles, Seaville leans more Republican than 56 of 85 neighbors.

Seaville runs about 31 points more Republican than New Jersey as a whole. New Jersey leans Democratic overall, while Seaville is one of the few Republican-leaning pockets.

Why Seaville 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 Seaville, not a ranked or complete list of what matters most.

Seaville votes Republican even though it is densely developed (about 22%, far below the New Jersey average of 61%). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 86% of households in Seaville are family households, above 97% of cities. Seaville runs against the grain of New Jersey, a Republican-leaning pocket in a Democratic-leaning state.

Food insecurity and voter turnout

Places with low food insecurity tend to turn out at a higher rate; Seaville, NJ sits in the bottom tenth nationally on this measure. Food insecurity does not directly drive turnout; it reflects economic hardship, which lines up with lower voting.

Why turnout in Seaville looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Seaville 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 75%, about 15 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 95% of households in Seaville own their home, about 20 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 96% of adults in Seaville have completed high school, above 86% of cities. Learn more about the findings and methodology on the political spectrum map.

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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.