Sea Cliff leans Democratic by roughly 28 points: about 64% of voters vote Democratic and 36% Republican.
About 91% of adults in Sea Cliff typically vote, above the U.S. average of about 62%. Among adults in Sea Cliff, ~58% vote Democratic, ~33% Republican, and ~9% don't vote. The map below shows estimated turnout by block group.
How Sea Cliff compares
Among cities within 25 miles, Sea Cliff leans more Democratic than 231 of 274 neighbors.
Sea Cliff runs about 16 points more Democratic than New York as a whole.
Politics vary noticeably by neighborhood within Sea Cliff. The north side is the most Democratic-leaning (D+36) and the southeast side is the least Democratic-leaning (D+22), a spread of about 14 points.
Why Sea Cliff 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 Sea Cliff, not a ranked or complete list of what matters most.
Dense areas vote Democratic. About 83% of residents in Sea Cliff live in densely developed areas, about 46 points above the U.S. average of 36%. High college attainment predicts Democratic voting, and Sea Cliff sits in the top quarter (about 61%, above 97% of cities).
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Sea Cliff, NY sits in the top tenth 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 Sea Cliff looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Sea Cliff 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 74%, about 14 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 97% of adults in Sea Cliff have completed high school, above 92% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Glen Head, NY R+12
- Glenwood Landing, NY D+4
- Glen Cove, NY Even
- Roslyn Harbor, NY D+3
- Old Brookville, NY R+21
- Port Washington, NY D+26
- Greenvale, NY R+11
- Baxter Estates, NY D+34
- Port Washington North, NY D+16
- Flower Hill, NY D+3
Cities with Similar Populations
- Robbins, NC R+50
- Eclectic, AL R+68
- Paradise, PA R+53
- McDonald, TN R+62
- Ocean View, NJ R+24
- Clinton, AR R+63
- Livonia, NY R+22
- Brusly, LA R+17
- St. Augustine South, FL R+23
- Bolton, MA D+28
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.