Upper Brookville leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 75% of adults in Upper Brookville typically vote, above the U.S. average of about 62%. Among adults in Upper Brookville, ~30% vote Democratic, ~45% Republican, and ~25% don't vote. The map below shows estimated turnout by block group.
How Upper Brookville compares
Among cities within 25 miles, Upper Brookville leans more Republican than 212 of 257 neighbors.
Upper Brookville runs about 32 points more Republican than New York as a whole. New York leans Democratic overall, while Upper Brookville is one of the few Republican-leaning pockets.
Why Upper Brookville 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 Upper Brookville, not a ranked or complete list of what matters most.
Upper Brookville votes Republican even though it is densely developed (about 68%, 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 89% of households in Upper Brookville are family households, in the top fraction of cities. Upper Brookville runs against the grain of New York, a Republican-leaning pocket in a Democratic-leaning state.
High-school completion, uninsured rate, and voter turnout
Places that combine high-school-completion-heavy adults and a low uninsured rate tend to turn out at a higher rate, as Upper Brookville, NY does.
Why turnout in Upper Brookville looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Upper Brookville 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 75%, about 15 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Upper Brookville have completed high school, above 93% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- East Norwich, NY R+19
- Matinecock, NY R+10
- Brookville, NY Even
- Old Brookville, NY R+21
- Muttontown, NY R+11
- Oyster Bay, NY R+13
- Locust Valley, NY R+16
- Mill Neck, NY R+8
- Glen Head, NY R+12
- Oyster Bay Cove, NY R+19
Cities with Similar Populations
- Tishomingo, MS R+73
- Thurmond, NC R+65
- Brackettville, TX R+24
- New Holland, OH R+58
- Wellington, UT R+72
- Yates Center, KS R+51
- Strattanville, PA R+47
- Gordonsville, TN R+64
- Melrose, WI R+31
- Darlington, IN R+57
All Local Stats
Home Services
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.