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

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

Nassau County is a true toss-up. About 50% of voters here vote Democratic and 50% Republican.

 

About 72% of adults in Nassau County typically vote, above the U.S. average of about 62%. Among adults in Nassau County, ~36% vote Democratic, ~36% Republican, and ~28% don't vote. The map below shows estimated turnout by block group.

How Nassau County compares

Among counties within 50 miles, Nassau County sits roughly in the middle of the political spectrum, with 6 neighbors leaning further in the place's direction and 11 leaning the other way.

Nassau County runs about 12 points more Republican than New York as a whole.

Politics vary noticeably by city within Nassau County. The south side runs the most Democratic (D+18) and the southeast side runs the most Republican (R+24), a spread of about 42 points.

Why Nassau County leans the way it does

Density, race composition, education, and family structure all sit close to their national averages in Nassau County. The lean here lands roughly where demographic data alone would predict.

Preventive-care access and voter turnout

Places with strong routine preventive-care access tend to turn out at a higher rate; Nassau County, NY sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.

Why turnout in Nassau County looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Nassau 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 69%, about 9 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 83% of households in Nassau County own their home, compared to around 48% 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.