Suffolk County, NY Political Map | Democrat & Republican Areas in Suffolk County

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

Suffolk County leans slightly Republican by roughly 8 points: about 46% of voters vote Democratic and 54% Republican.

 

About 73% of adults in Suffolk County typically vote, above the U.S. average of about 62%. Among adults in Suffolk County, ~34% vote Democratic, ~39% Republican, and ~27% don't vote. The map below shows estimated turnout by block group.

How Suffolk County compares

Among counties within 50 miles, Suffolk County is the most Republican-leaning.

Suffolk County runs about 21 points more Republican than New York as a whole. New York leans Democratic overall, while Suffolk County is one of the few Republican-leaning pockets.

Politics vary noticeably by city within Suffolk County. The south side is the most split-leaning (R+13) and the northeast side is the least split-leaning (R+3), a spread of about 10 points.

Why Suffolk County leans the way it does

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

Suffolk County votes Republican even though it is densely developed (about 86%, far above the New York average of 36%). 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 Suffolk County are family households, above 93% of counties. Suffolk County runs against the grain of New York, a Republican-leaning pocket in a Democratic-leaning state.

Population density and Democratic lean

Places with high population density tend to lean Democratic; Suffolk County, NY sits in the top tenth nationally on this measure.

Why turnout in Suffolk County looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Suffolk County 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 67%, about 7 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 83% of households in Suffolk County own their home, compared to around 52% in nearby counties. 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 York State Board 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.