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

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

Waterloo leans Republican by roughly 24 points: about 38% of voters vote Democratic and 62% Republican.

 

About 74% of adults in Waterloo typically vote, above the U.S. average of about 62%. Among adults in Waterloo, ~28% vote Democratic, ~46% Republican, and ~26% don't vote. The map below shows estimated turnout by block group.

How Waterloo compares

Among cities within 25 miles, Waterloo leans more Republican than 116 of 172 neighbors.

Waterloo runs about 30 points more Republican than New Jersey as a whole. New Jersey leans Democratic overall, while Waterloo is one of the few Republican-leaning pockets.

Politics vary noticeably by neighborhood within Waterloo. The north side is the most Republican-leaning (R+27) and the west side is the least Republican-leaning (R+11), a spread of about 16 points.

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

Car-dependent areas vote Republican. About 87% of residents in Waterloo drive to work alone, about 13 points above the U.S. average of 74%. A high family-household share predicts Republican voting, and about 79% of households in Waterloo are family households, above 87% of cities. Waterloo 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; Waterloo, 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 Waterloo looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Waterloo 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 73%, about 13 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 90% of households in Waterloo own their home, above 80% of cities. High high-school completion lines up with higher turnout, and about 97% of adults in Waterloo have completed high school, above 87% 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.