Selden leans Republican by roughly 20 points: about 40% of voters vote Democratic and 60% Republican.
About 64% of adults in Selden typically vote, near the U.S. average of about 62%. Among adults in Selden, ~26% vote Democratic, ~38% Republican, and ~36% don't vote. The map below shows estimated turnout by block group.
How Selden compares
Among cities within 25 miles, Selden leans more Republican than 88 of 123 neighbors.
Selden runs about 33 points more Republican than New York as a whole. New York leans Democratic overall, while Selden is one of the few Republican-leaning pockets.
Why Selden 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 Selden, not a ranked or complete list of what matters most.
Selden votes Republican even though it is densely developed (about 97%, 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 79% of households in Selden are family households, above 87% of cities. Selden 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; Selden, NY sits above the national average 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 Selden looks the way it does
Turnout in Selden sits close to the national pattern. Routine healthcare access, homeownership, education, and food security all land near their national averages here. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Centereach, NY R+19
- Farmingville, NY R+24
- Coram, NY Even
- Terryville, NY R+21
- Port Jefferson Station, NY R+15
- Lake Grove, NY R+24
- Holtsville, NY R+28
- Stony Brook University, NY D+35
- Medford, NY R+10
- Mount Sinai, NY R+24
Cities with Similar Populations
- Wildwood, MO R+16
- Newport, RI D+47
- Coos Bay, OR R+6
- Avon, OH R+8
- Ives Estates, FL D+35
- Mill Creek East, WA D+23
- Duncan, OK R+51
- Waukee, IA Even
- Marietta, OH R+29
- Festus, MO R+42
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.