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

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

Fairfield leans heavily Republican by roughly 38 points: about 31% of voters vote Democratic and 69% Republican.

 

About 88% of adults in Fairfield typically vote, above the U.S. average of about 62%. Among adults in Fairfield, ~27% vote Democratic, ~61% Republican, and ~12% don't vote. The map below shows estimated turnout by block group.

How Fairfield compares

Among cities within 25 miles, Fairfield leans more Republican than 276 of 281 neighbors.

Fairfield runs about 44 points more Republican than New Jersey as a whole. New Jersey leans Democratic overall, while Fairfield is one of the few Republican-leaning pockets.

Politics vary noticeably by neighborhood within Fairfield. The north side is the most Republican-leaning (R+47) and the southeast side is the least Republican-leaning (R+29), a spread of about 17 points.

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

Fairfield votes Republican even though it is densely developed (about 69%, modestly above the New Jersey average of 61%). Here an older population outweighs the Democratic lean that density usually predicts. A high family-household share predicts Republican voting, and about 79% of households in Fairfield are family households, above 87% of cities. Fairfield 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; Fairfield, 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 Fairfield looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Fairfield 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 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Fairfield have completed high school, above 91% 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.