Holbrook leans Republican by roughly 26 points: about 37% of voters vote Democratic and 63% Republican.
About 76% of adults in Holbrook typically vote, above the U.S. average of about 62%. Among adults in Holbrook, ~28% vote Democratic, ~48% Republican, and ~24% don't vote. The map below shows estimated turnout by block group.
How Holbrook compares
Among cities within 25 miles, Holbrook leans more Republican than 112 of 134 neighbors.
Holbrook runs about 38 points more Republican than New York as a whole. New York leans Democratic overall, while Holbrook is one of the few Republican-leaning pockets.
Politics vary noticeably by neighborhood within Holbrook. The north side is the most Republican-leaning (R+30) and the southeast side is the least Republican-leaning (R+19), a spread of about 11 points.
Why Holbrook 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 Holbrook, not a ranked or complete list of what matters most.
Holbrook votes Republican even though it is densely developed (about 98%, 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 75% of households in Holbrook are family households, above 77% of cities. Holbrook runs against the grain of New York, a Republican-leaning pocket in a Democratic-leaning state.
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Holbrook, NY sits in the top quarter 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 Holbrook looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Holbrook 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 68%, about 8 points above the U.S. average of 60%. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Holtsville, NY R+28
- North Patchogue, NY R+20
- Bohemia, NY R+33
- Lake Ronkonkoma, NY R+22
- Ronkonkoma, NY R+26
- Farmingville, NY R+24
- Blue Point, NY R+13
- Sayville, NY R+18
- Patchogue, NY R+2
- Bayport, NY R+19
Cities with Similar Populations
- Gallup, NM D+12
- Dix Hills, NY R+4
- Mount Holly, NC R+21
- Golden Gate, FL R+4
- El Cerrito, CA D+70
- Mountain Home, AR R+47
- Rochester, MI Even
- Ferndale, WA Even
- El Sobrante, CA D+46
- New Castle, IN R+40
All Local Stats
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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.