Stony Brook, NY Political Map | Democrat & Republican Areas in Stony Brook

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

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

 

About 67% of adults in Stony Brook typically vote, near the U.S. average of about 62%. Among adults in Stony Brook, ~42% vote Democratic, ~25% Republican, and ~33% don't vote. The map below shows estimated turnout by block group.

How Stony Brook compares

Among cities within 25 miles, Stony Brook leans more Democratic than 131 of 137 neighbors.

Stony Brook runs about 11 points more Democratic than New York as a whole.

Politics vary noticeably by neighborhood within Stony Brook. The northeast side runs the most Democratic (D+51) and the southeast side runs the most Republican (R+6), a spread of about 57 points.

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

Areas with high college attainment vote Democratic. About 72% of adults in Stony Brook hold a bachelor's degree, about 43 points above the U.S. average of 28%. Dense areas vote Democratic, and Stony Brook sits in the top fifth on density (about 86%, above 95% of cities). A high never-married share predicts Democratic voting, and about 58% of adults in Stony Brook have never been married, in the top fraction of cities.

Paved land cover and Democratic lean

Places with extensive paved surfaces tend to lean Democratic; Stony Brook, NY sits in the top tenth nationally on this measure. Paved ground does not change how people vote; it mostly reflects how urban and built-up a place is.

Why turnout in Stony Brook looks the way it does

Areas with strong routine healthcare access turn out at higher rates. Stony Brook 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 91% of households in Stony Brook own their home, about 16 points above the U.S. average of 75%. High high-school completion lines up with higher turnout, and about 98% of adults in Stony Brook have completed high school, above 94% 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 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.