Great River leans Republican by roughly 18 points: about 41% of voters vote Democratic and 59% Republican.
About 84% of adults in Great River typically vote, above the U.S. average of about 62%. Among adults in Great River, ~34% vote Democratic, ~50% Republican, and ~16% don't vote. The map below shows estimated turnout by block group.
How Great River compares
Among cities within 25 miles, Great River leans more Republican than 94 of 154 neighbors.
Great River runs about 30 points more Republican than New York as a whole. New York leans Democratic overall, while Great River is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Great River. The northeast side is the most Republican-leaning (R+28) and the south side is the least Republican-leaning (R+17), a spread of about 11 points.
Why Great River 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 Great River, not a ranked or complete list of what matters most.
Great River votes Republican even though it is densely developed (about 32%, above 81% of cities). State and regional patterns outweigh the Democratic lean that density usually predicts here. A high family-household share predicts Republican voting, and about 76% of households in Great River are family households, above 79% of cities. Great River runs against the grain of New York, a Republican-leaning pocket in a Democratic-leaning state.
Cancer-screening access and voter turnout
Places with high colon-cancer-screening access tend to turn out at a higher rate; Great River, NY sits in the top tenth nationally on this measure. Cancer screening does not drive turnout; it reflects income, insurance, and healthcare access.
Why turnout in Great River looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Great River 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 72%, about 12 points above the U.S. average of 60%. Homeowners vote more often than renters, and about 96% of households in Great River own their home, about 21 points above the U.S. average of 75%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- East Islip, NY R+30
- Oakdale, NY R+31
- Islip Terrace, NY R+26
- North Great River, NY R+29
- Islip, NY R+20
- West Sayville, NY R+18
- Bohemia, NY R+33
- Sayville, NY R+18
- Central Islip, NY D+27
- Bay Shore, NY D+7
Cities with Similar Populations
- Scroggins, TX R+66
- Fertile, MN R+35
- Lloyd, FL R+36
- Bertha, MN R+59
- Brook, IN R+58
- Calmar, IA R+34
- Freehold, NY R+26
- Gholson, TX R+67
- Sun, MI R+45
- Hankinson, ND R+49
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.